Walgreens has a current offer that is $10 off $20 at Wphoto. The coupon code is ALLPHOTO and you enter it at check out.
Even better: If you read the fine print, it says the ALLPHOTO code is good for up to 5 uses per account, so that is huge savings if you plan to do a photo mug or ornament for several family members as Christmas gifts. This offer is online only and can't be used at the store. Depending upon what you have in your cart, you may be able to use other codes too. Code does not cover shipping though.