I decided I wanted to move up the pick-up time on my Dollar reservation by 30 minutes. I also changed the return time by 30 minutes (i.e., there was no change in how long I was going to have the car out). When I did this, the rate was recalculated and it was $20 less than I'd originially booked! Whoo hoo! So if you are going to WDW this week (my ressie is for 8/23 - 8.30), go to the website and see if the rates have come down. I originally booked during the first week of August and the rates have come down twice since then.