Most people suggest booking in the UK before you go and paying for everything up front as it's cheaper. Try http://www.ch3000.com or http://www.netflights.com

luci

We used Thrifty I think, it was through Netflights and we collected at Tampa. We ususally use dollar in vegas but thrifty were a little cheaper.

I wouldn't want to use them again though, as they tried to say we should upgrade, and claimed we didn't have adequate insurance despite us booking platinum fully inclusive. I think they were lying about the insurance though, as they couldn't seem to tell me what the missing cover was, they were calling it XXX (3 letters) but wouldn't tell me what it stood for and explained it as something completely unrelated. I think they were trying to sell me personal accident insurance, and insurance in case we got a puncture.

Thank you for this advice. I will avoid Thrifty and book before I go