The Random Good Stuff post that mentioned that German site also pointed me to Last Minute Auction.
I'm not into eBay, but this looks like an excellent site if you are.
It trawls eBay for auctions that have less than an hour to go and where the current bid is under a dollar. Hence, there are lots of potential bargains there.
Of course, we all know that many auctions stay at very low bids until 30 seconds before they end, but it's still worth a try, I guess.