Justin - the main bidding site is www.priceline.com. Hotel, air, rental car. Hotels seem to work the best, and rental car can be good. From time to time people have had good success on air travel tickets.

On that site is a Help Menu that has a lot more information about the bidding process.

A companion site is www.betterbidding.com where people report bidding results, and can get assistance both from moderators and members.

For bidding, these two might be a good start for you, and then post back with more specific questions.

Romelle