As the seller, we don't have the ability to retract your bid. If the auction has not closed yet, you can retract your own bid by clicking on this link:
http://offer.ebay.com/ws/eBayISAPI.dll?RetractBidShow
If the auction has already closed, then per your eBay user agreement, your winning bid or Buy It Now purchase forms a legally binding contract. Please complete checkout and pay for your item(s) within 3 days, or contact us to find out further information. You can call us toll free at 1-800-257-3762.
Our business hours are Monday - Friday, 8:00 AM - 5:30 PM CST. We are closed weekends and holidays.
Below is the information from the eBay FAQ:
I am the winning bidder and I no longer want to complete the transaction:
If a bidder fails to complete a transaction on an item they have won, the seller may file for final value fees. Such action will generate a non-paying bidder infraction against the winning bidder's account and the account will be suspended for 30 days. The seller may also choose to leave negative feedback. It's important to remember that when a member places a bid on an eBay auction, they are committed to honor that bid and follow through with the commitment.
All bidders should read the item description completely before bidding. If a member is interested in an item, but has questions, they should email the seller and have their questions resolved before a bid is placed. This will help to avoid future situations when the bidder doesn't want to complete a transaction after an auction has ended.