This week Schnucks has Purina Cat & Kitten Chow 3.15lb. bags on sale buy one, get one free. Use the $2/1 coupon from the Smart Source 1/8 insert to get 2 bags for $3.99
If your store allows you to use a coupon on the free item, then you may be able to get 2 bags for only $1.99!
There are many pet food pantries around the country, and there are two in the St Louis metro area-Bi-State Pet Food Pantry and the Jefferson County Pet Food Pantry. Both sites have collection locations at area Petco/PetSmart stores, so consider picking up a few bags and making a donation.