I called Hertz and they said right now it's $55 for the day for a mid-size , less than I expected. But I need it for July 2000 and they said they expect the rate to go up slightly at that time. BUt it still sounds great to me.
I also looked around on other boards and someone said that Mears is $19 per person from Universal to KSC, but only on Monday, Wednesday and Friday. I'll call YouRide just to have something to compare, but now I see that going on a day trip to NASA is definitely within my budget!