We, too, used the mousesavers.com site. I noted all the codes that were available, then went to the rental car websites and plugged in each applicable code to see what it would cost. We paid $175 (taxes and fees included) for a mid-size car through Budget but were given a mini-van when we checked in! One tip I found very useful - I signed up for Budget's fastbreak program while I was on their site. I wasn't really sure what it would get me, but it said something about making the pickup process faster, and it was free. When we got to MCO, there were 25-30 people in line at the Budget counter, and it would have taken forever. Our fastbreak card let us go directly to the Budget kiosk in the parking garage, where we were given the keys to our mini-van in a matter of seconds. I assume that most car rental companies have something similar, and it's worth signing up for it just for that.