Priceline didn't work for me at LAX (I'm a frequent traveller to Hawaii and was planning to use Priceline for rentals).. plus if it had worked.. I would have had to prepay the entire rental no refunds..

But, the AutoSlash liaison helped me out.. and I was able to cut my rates 70%.. so try www.autoslash.com.. doesn't hurt and you can cancel the car rental anytime..