And they are offering a free tub of their spread (value up to $2.99) to convince you to do it.
Go here to download the form to request your coupon for a free tub of spread. You will need to include the original register receipt from the other buttery spreads, with the purchase circled, along with the UPC code from that product. Purchases must be made between April 1 and May 31, and the offer is available while supplies last. Your free coupon will be sent by mail once your information is received.