Coupons available when I signed into my PetPerks account included a PetSmart $2.00 coupon off of Purina One Beyond Cat food. PetSmart has the 16oz. boxes on sale $2.49 regular price $2.99. You can print off two of the coupons. I do not recall how long the sale is for or the exp. date of the PetSmart coupon.
You can also get $2 manufacturer coupons from Purina One Beyond facebook page. I already used my facebook coupons at Meijer when they had it on sale so that I ended up getting those free.