Check Travelocity. I just went north and rented a car. I did the search and I was getting the usual amount compared to everywhere else and then at the bottom, kinda hard to see I saw a thing about we have a great deal for you (something like that). Ended up getting $40 off my rental. I was renting for 3 1/2 days (being charged for 4 though) so it came out to $48. after the coupon code.
My flight ended up being late going up so I picked it up later then expected and when I returned it I had one minute left for the day. So I was charged for a 3 day rental, minus the $40 savings so my 3 day car rental was $16.78! Most of that was taxes and fees. Not a shabby deal!