Priceline.com is the only online travel site that lets you "Name Your Own Price" which allows customers to negotiate their airline and hotel rates. It works like this; you submit a price that you think is fair for airfare, hotels and rental cars.  Then the airlines, hotels and rental car company can either accept or refuse your offer price. If your offer is accepted, then Priceline.com will automatically book it for you.

You are also able to get "frequent flyer miles" on regular discounted ticket. However, you can't get "frequent flyer miles" on "Name Your Own Price" tickets.  Priceline.com also offers a low fare guarantee for flights and low rate guarantee for hotels.  You are only eligible if you “Name Your Own Price.”

Want to go on a cruise? Priceline.com offers a 110% guarantee on all cruise bookings. What does this mean?  This means that if you book a cruise with Priceline.com and within the next 48 hours you find the cruise ship, booking dates, and cabin selection at a lower price, then Priceline.com will credit you the difference.  This guarantee is not available for group bookings.

Visit the official Priceline.com site.