Pamela's gluten-free baking mix on sale on Amazon

Get 4 lb. bags of Pamela’s Ultimate Gluten-Free Baking and Pancake Mix for $10.20 each:
A 3-pack of 4-pound bags is on sale for $36.
Use Subscribe & Save for 15% off (brings it down to 30.60) and free shipping. You can cancel subscribe and save immediately (I do it from the order confirmation page - click on "manage my subscriptions". My order still arrives, but no further ones do.)