Ebay is popular, but for a truly professional service you can do better. I've just put a bid in on this little beauty here. Hope to get a dozen bottles of quaffing wine for less than $50.00 delivered. And an interesting blend of sangiovese and shiraz as well.
There are a few little points you might like to consider in this article about wine auctions but it is really simple. The page also has links to what is happening on Ebay in the way of wine auctions, a convenient way for you to keep informed.