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For those travelling to USA.
This site offers normal car rental but it also has a "Name Your Own Price®" section.
Prices do change according to season, I last used it in December 2010 and copped a bargain for $11 a day for a really good car.
One "problem" is that you need to register with a USA address. If you have a freight forwarding address you can use that. Or, you can use the address where you will be staying.
Best way to use the site is to first search for rental cars for specific dates.
A page will open with the results.
At the top, will be a section titled "Name Your Own Price® and Save Up To 40%". Click on "+ See Winning Bids!" to get a guide on pricing.
BUT, don't go by the full rental prices shown in the main section, click on the "Save up to 40% on your rental car" banner at the bottom of the page, the prices show cheaper.
Going by those prices, I usually put a bid in for less than half the price then bid up until accepted.
Just bear in mind that the bid price isn't the final price (so bid wisely) as it does say "Total Charges, including taxes and fees, are displayed on the following page".
If used correctly, you get a really good deal.
Ok for people who don't know about Priceline.