http://www.cellarexchange.com/ - Your free wine auction and cellar exchange network. Post your wines for sale and bid for wines without a buyer's or seller's commission, or fees at CellarExchange.com.
http://www.winecommune.com/ - WineCommune, which hosts an average of 1000 wine auctions a day, allows sellers to reach a large wine buying audience, and buyers a wide selection of wine from many sources. WineCommune has become the main storefront for many retailers and wine brokers as they are given access to its 4,500 plus registered user base.
http://search.ebay.com/ - eBay has got thousands of wines listed for bid. You've heard of eBay right?