Web-based sniper JustSnipe now supports bid groups, which they are calling "Snipe Groups".

Bid groups is a common feature in sniping tools. It allows you to win one (or more) auctions in a group, and automatically cancel bidding on the remaining auctions - so several auctions can be scheduled for bidding in advance even if you only want to win one of them.

JustSnipe offers users 5 free bids per week, or is $5.00 per month for unlimited snipes.