I was trying to use coupon codes and contract ID numbers at National. Everything kept coming up "invalid." Even though expiration dates were June and July 2014. I called National and the lady told me that those coupons reached their max. Had the same problem with Dollar. I'm thinking that the more popular travel times, like holidays, that those coupons don't even apply in the first place. National lady said that MCO is an extremely popular, high volume for them. There have been many threads/postings about car rentals lately. It seems most people are getting their best rate from Dollar right now.