Where I live the big grocer's put London Broil on sale for $1.99 a lb (Arizona)

Skinless, boneless chicken in huge plastic bags (I think you usually get about 4 lbs) and they are FROZEN GLAZED so they don't stick together and when on sale, they are about $2 a lb

Eggs: around Easter they get really cheap and I hard boil a dozen or so because they will keep longer then regular, uncooked, refrigerated eggs.

Grow your own! I do limited gardening in a 10' x 10' fenced area and its a good and cheap way to go organic!