Rule 497(e)

File Nos. 333-52956 and 811-07549

SCHWAB ONESOURCE ANNUITY™

SUPPLEMENT DATED October 16, 2007

to the Prospectus dated May 1, 2007 for the

Variable Annuity-1 Series Account

of Great-West Life & Annuity Insurance Company

Dear Schwab OneSource Annuity™ Contract Owner:

This supplement adds certain information to and amends certain information contained in the Prospectus dated May 1, 2007. Please read it carefully and keep it with your Prospectus for future reference.

IMPORTANT INFORMATION REGARDING MARKET TIMING & EXCESSIVE TRADING

Effective immediately, the section entitled “Market Timing & Excessive Trading” on pages 24-25 of the Prospectus is deleted and replaced in its entirety with the following:

Market Timing & Excessive Trading

The Contracts are intended for long-term investment and not for the purpose of market timing or excessive trading activity. Market timing activity may dilute the interests of Contract Owners in the underlying Portfolios. Market timing generally involves frequent or unusually large Transfers that are intended to take advantage of short-term fluctuations in the value of a Portfolio's portfolio securities and the reflection of that change in the Portfolio's share price. In addition, frequent or unusually large Transfers may harm performance by increasing Portfolio expenses and disrupting Portfolio management strategies. For example, excessive trading may result in forced liquidations of portfolio securities or cause the Portfolio to keep a relatively higher cash position, resulting in increased brokerage costs and lost investment opportunities.

We maintain procedures designed to prevent or minimize market timing and excessive trading (collectively, “prohibited trading”) by Owners. As part of those procedures, certain of the Portfolios have instructed us to perform standardized trade monitoring, while other Portfolios perform their own monitoring and request reports of the Owner's trading activity if prohibited trading is suspected. If an Owner’s trading activity is determined to constitute prohibited trading, as defined by the applicable Portfolio, Great-West will notify the Owner that a trading restriction will be implemented if the Owner does not cease the prohibited trading. Some Portfolios may require that trading restrictions be implemented immediately without warning, in which case we will notify the Owner of the restriction imposed by the Portfolio(s), as applicable.

If a Portfolio determines, or, for Portfolios for which we perform trade monitoring, we determine based on the applicable Portfolio’s definition of prohibited trading, that the Owner continues to engage in prohibited trading, we will restrict the Owner from making Transfers into the identified Portfolio(s) for the period of time specified by the Portfolio(s). Restricted Owners will be permitted to make Transfers out of the identified Portfolio(s) to other available Portfolio(s). When the Portfolio’s restriction period has been met, the Owner will automatically be allowed to resume Transfers into the identified Portfolio(s).

For Portfolios that perform their own monitoring, the Series Account does not impose trading restrictions unless or until a Portfolio first detects and notifies us of prohibited trading activity. Accordingly, we cannot prevent all prohibited trading activity before it occurs, as it may not be possible to identify it unless and until a trading pattern is established. To the extent such Portfolios do not detect and notify us of

prohibited trading or the trading restrictions we impose fail to curtail it, it is possible that a market timer may be able to make prohibited trading transactions with the result that the management of the Portfolios may be disrupted and the Owners may suffer detrimental effects such as increased costs, reduced performance, and dilution of their interests in the affected Portfolios.

We endeavor to ensure that our procedures are uniformly and consistently applied to all Owners, and we do not exempt any persons from these procedures. We do not enter into agreements with Owners whereby we permit prohibited trading. Subject to applicable state law and the terms of each Contract, we reserve the right without prior notice to modify, restrict, suspend or eliminate the Transfer privileges (including telephone Transfers) at any time, to require that all Transfer Requests be made by you and not by your designee, and to require that each Transfer Request be made by a separate communication to us. We also reserve the right to require that each Transfer Request be submitted in writing and be signed by you.

The Portfolios may have adopted their own policies and procedures with respect to frequent purchases and redemptions of their respective shares. The prospectuses for the Portfolios should describe any policies and procedures relating to restricting prohibited trading. The frequent trading policies and procedures of a Portfolio may be different, and more or less restrictive, than the frequent trading policies and procedures of other Portfolios and the policies and procedures we have adopted to discourage prohibited trading. For example, a Portfolio may impose a redemption fee. The Owner should also be aware that we are legally obligated to provide (at the Portfolios’ request) information about each amount you cause to be deposited into a Portfolio (including by way of premium payments and Transfers under your Contract) or removed from the Portfolio (including by way of withdrawals and Transfers under your Contract). If a Portfolio identifies you as having violated the Portfolio’s frequent trading policies and procedures, we are obligated, if the Portfolio requests, to restrict or prohibit any further deposits or exchanges by you in respect to that Portfolio. Under rules recently adopted by the SEC we are required to: (1) enter into a written agreement with each Portfolio or its principal underwriter that will obligate us to provide to the Portfolio promptly upon request certain information about the trading activity of individual Owners and (2) execute instructions from the Portfolio to restrict or prohibit further purchases or Transfers by specific Owners who violate the frequent trading policies established by the Portfolio. Accordingly, if you do not comply with any Portfolio’s frequent trading policies and procedures, you may be prohibited from directing any additional amounts into that Portfolio or directing any Transfers or other exchanges involving that Portfolio. You should review and comply with each Portfolio’s frequent trading policies and procedures, which are disclosed in the Portfolios’ current prospectuses.

We may revise our market timing and excessive trading policy and related procedures at our sole discretion, at any time and without prior notice, as we deem necessary or appropriate to comply with state or federal regulatory requirements or to impose additional or alternative restrictions on Owners engaging in prohibited trading. In addition, our orders to purchase shares of the Portfolios are generally subject to acceptance by the Portfolio, and in some cases a Portfolio may reject or reverse our purchase order. Therefore, we reserve the right to reject any Owner's Transfer Request if our order to purchase shares of the Portfolio is not accepted by, or is reversed by, an applicable Portfolio.

You should note that other insurance companies and retirement plans may also invest in the Portfolios and that those companies or plans may or may not have their own policies and procedures on frequent Transfers. You should also know that the purchase and redemption orders received by the Portfolios generally are "omnibus" orders from intermediaries such as retirement plans or separate accounts funding variable insurance contracts. Omnibus orders reflect the aggregation and netting of multiple orders from individual retirement plan Owners and/or individual owners of variable insurance contracts. The nature of such orders may limit the Portfolios' ability to apply their respective frequent trading policies and procedures. As a result, there is a risk that the Portfolios may not be able to detect potential prohibited trading activities in the omnibus orders they receive. We cannot guarantee that the Portfolios will not be harmed by Transfer activity relating to the retirement plans and/or other insurance companies that invest in the Portfolios. If the policies and procedures of other insurance companies or retirement plans fail to successfully discourage frequent Transfer activity, it may affect the value of your investments in the Portfolios. In addition, if a Portfolio believes that an omnibus order we submit may reflect one or more Transfer Requests from a Owner engaged in frequent Transfer activity, the Portfolio may reject the entire

omnibus order and thereby interfere with our ability to satisfy your Request even if you have not made frequent Transfers. For Transfers into more than one investment option, we may reject or reverse the entire Transfer Request if any part of it is not accepted by or is reversed by a Portfolio.

This Supplement must be accompanied by or read in conjunction with the current Prospectus, dated May 1, 2007. Please keep this supplement for future reference.