Yes, you have to be a member, which means you have to buy an Entertainment Book. I bought one for our local area for some restaurant discounts, but the travel coupons are good for anywhere. Right now, the books are $9.99, I think. I think they expire in November? I'm not sure about that, though. Anyhoo - if you are going before the book expires, it might be worth it to get one. I'm going to get another one when the new ones come out, for our trip in Dec. However, if you know anyone who has a book and won't be using their National Coupons, they might just send you a coupon to use. You have to turn in the coupon when you pick up the car, I think. At least that's what I understand according to these threads. 
