Amex Offers has added a Best Western deal where you will received a $20 statement credit with any purchase of $100 or more at Best Western. You can get the offer by tweeting #AmexBW (Sync your card with your account here) or you can add the offer to your card by logging into your AMEX account.
The $100 purchase is the total charge to your card, so you can include taxes and fees. If you have a Best Western charge that goes over $200 or $300, you can split it between two or more Amex cards to receive multiple credits.