Does the 8% case discount on wet food apply if that item is on promotion or on sale? No, the 8% discount does not apply if that item is on promotion or on sale. Related articles What purchases are eligible for the Frequent Feeder program? How is sales tax determined if there is a discount/coupon/promotion/ sale on the item? Do you ship to P.O. boxes, APO/FPO addresses, or international addresses?