http://local.amazon.com/

It'll want you to subscribe to emails, just click on I already subscribe and enter. After entering your city, if it's on the list, scroll down to the bottom of the page, coupon is on the left. If your city doesn't work, you can use Columbus, OH. You should probably call your BK to make sure that they are a "participating" (I hate that disclaimer!)restaurant.

Voucher will expire if not used by November 4, 2012
Customers must take printed voucher in to redeem; vouchers displayed on mobile devices will not be accepted
Limit 1 voucher per customer per option
Only 1 voucher may be redeemed per visit
Voucher only valid for option purchased; cannot be redeemed for other menu items
Available for use at participating BURGER KING® restaurants nationwide. Participation may vary by restaurant and this offer may not be available at all BURGER KING® restaurants
Go to www.bk.com to find a location near you

Additional conditions apply.