
Well if your a ebay shopper then you know the best time to place a bid is seconds before it closes. Posting a bid early only can possibly start a bidding war and the price only goes up and up and up. Nothing is worse also if the auction you really want ends at like 3am. What do you do in that case? Do you bid early or do you set the alarm clock to get up and bid?
They do have a FREE 14 day trial but if you go past the 14 days its still pretty cheap. They only charge (after the 14 days) if you win and the fee's are between $0.25 to $10.00. The fee's break down to your charged 1% of the price of the auction (min of $0.25 and max of $10.00). You can read about the fee's HERE.
I have used this site in the past and never lost a aution while using it 

Single & Not Looking
eBay Countdown is a brand new way to track and win items on eBay. Countdown provides buyers with a competitive edge with instant item updates for current bid and time remaining, easy interface to monitor items in My eBay buying and a fast and easy bidding interface. Countdown also provides a way to search for last minute deals. Best of all, no download is required to use eBay Countdown. Countdown is a completely optional tool and users can always access their items via the eBay web site as well.
Karma, it works every time!