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 How is sales tax determined if there is a discount/coupon/promotion/ sale on the item? What purchases are eligible for the Frequent Feeder program? Do you ship to P.O. boxes, APO/FPO addresses, or international addresses?