I've only used eSnipe. The first two weeks of membership are free then they charge you something like 1% of the winning bid. You have to buy "eSnipe points" to pay your fee, and I think the minimum you can buy at a time is $5 worth. I've only won once (the eBay bids the rest of the time have gone above my target bid before the bidding time came) and it was during the free period.