If anyone hasn't heard of this site yet, it's a great tip for money saving on a road trip.
I'm planning on visiting a few states this summer, starting in New Jersey and down to Louisiana. Groupon offers you money saving deals on food, entertainment and bars by state and town. The deal is sent to you by e-mail and you print it off and generally just show it to the retailer of the advertised place. They advertise new deals daily for different places.
So far I've bought half price tickets for a platinum tour of Graceland in Memphis and have seen plenty of offers where you pay a certain amount in advance (e.g. $5) and get double your money to spend in the bar. Great savings!!!!
I don't work for Groupon, maybe I should :)