Getting lower prices at Marriott brands takes a bit of work, but can pay off, especially if you don't like advance purchase. At a Fairfield Inn I can use, the regular AA rate isn't as good as I'd like, and only good AA rate seems to be advance purchase (and not available anywhere near day of stay). But if you go to the Marriott forum on FlyerTalk, there's a sticky thread which has (in post 1) a giant collection of promo codes you can try. Oodles of them won't work for any one particular property, but with enough patience, I found a couple which gave an AAA rate which was the same lower cost as that advance purchase rate but allows cancel up to 6 pm on the day of stay!

At Best Western, there's less flexibility with promo codes. There generally appears to be only the Manager's Special rate (via WEBONLY or TWEET1 or other codes) which is a prepaid rate (but at many hotels works up through the day of stay) but typically only saves a couple bucks and at some hotels doesn't save anything at all off the rates you can see without any promo code.