I think you can go one of two ways (IIRC) with Priceline. You can try to bid for the best price and you do need to give all your CC# info and you are bound to purchase IF they agree to your price that you offered. I also think they have the same procedure as well as Expedia, Travelocity, etc., that you can also see the price before buying. You can also check Hotwire.com and Travelworm.com for deals. Hotwire shows you the lowest price, you just have to agree to purchase it regardless of times, connections, etc. I scored a great fare to Miami from Hotwire several months ago. Good luck!