the cheapest fresh meat i've found is chicken thighs. i've seen them for as little as $2 for a pack of four. throw them in a toaster oven on some tin foil they're pretty good.
^ here are ways to use this for meals:
-chicken quesadillas (literally just tortillas and cheese. throw some chicken pieces in there.)
-baked potatoes (potatoes and cheese. throw some chicken pieces on there.)
-augmented ramen. Get the cheap ramen noodles and throw frozen peas/corn/green onion/egg whatever you have lying around, and some chicken bits.
-easy pasta. I buy the cheapest noodles i can ($0.69 farfalle), throw in some chicken pieces and cheese. parmesan can be expensive but if you get mozzarella or shredded "pizza mix" kroger usually has it pretty cheap.
that's four meals for about $12 (unless you live in la in which case thats about $25 because fuck socal)