Purina Friskies Treats go on sale fairly often for 4/$5 or even $1 a piece at various stores. Use this $1 coupon to get them for free or almost free! This coupon will likely go fast, so print it now if you are interested!
You could also use the B1G1 from 1/24 SS to get 2 for free or almost free!
(Thanks Common Sense With Money!)