Thanks Sheryl. I was finally able to get a car.
Originally got a compact for 14 days in July for $15/day-Budget (priceline). Wanted to increase my holiday by 4 days, no trouble with hotel, got the same one - Wyndham Orlando - $30/day (original bid was plus $20 AMX bonus, this new bid for 4 additional days was also for $30/day plus $5. priceline bonus).
Anyway - back to the car - I ended up paying $20/day for a compact car for my addional days, not bad though, and its through Budget again, so at least I don't have to go back to the airport to switch cars.