Just keep re-booking and then cancel the old ressie... I'm on Ressie # 8 for this upcomming trip....
Do you have Emerald Club? It is a BIG discount, I used that along with the Entertainment $20 off... I got 12 days in a FULL SIZE 4dr for $245, When I originally booked in Oct. it was $328... it has steadily gone down... I spoke to a rep, they said it's based on availability at the time of your booking...
By the way, Last year's trip, I had a decent rate booked for 4 days.., I printed out my ressie, handed it the Emerald Booth after I picked out my own car from the section of the lot for emerald reserved guests, and I was charged EXACTLY that amount, even though I went over a few hours when I returned it, and I checked before I left NY and the rate was about $70 more than when I booked...
SO NATIONAL has made me a happy camper, I am now loyal to them.