National with KLM is $412 for minivan for 8 days in early August.
Carrentalsavers is $433.
Guess, I'll have to keep hunting. Hoping to get down to $300 by the time we need to travel.
Just booked a minivan with priceline name your own price for $35/day. We'll be there 8-16 leaving 8-22. Total after taxes/fees is $288 for a 6 day rental (sat to fri).
I've always had great luck with priceline. Last time we were able to book a full size car for $11/day.