Booked intermediate, National, Emerald Aisle for my brother for 16 days (July 4-19), total equal to $259 including taxes. (Used Priceless contract ID 6600330 and Entertainment coupon 10009123.) (That was back in March.)
Just the other day, I booked National EA for myself for July 7-12 (5 days worth) for $124 including taxes (using American Express contract id 5125601 and Ent. coupon code 10009123.) This is the weekly rate, so I believe it would come up the same price for a full 7 days.
The thing is, I believe you need to at least have an American Express card when you pick up the car.