@webstar138 How much time are you willing to spend butchering meat?
In addition to using a slow cooker, I also used to buy a lot of whole chickens that I would cook in the oven two or three at a time.
You spend like an hour a week picking the meat off the bone, but it saved me a ton of money. You could also just get one of those desktop chicken rotisseries and cook them in there, but I always found that they were kind of a pain to clean. Costco also sells rotisserie chicken for $5 each. Assuming you are not a mass monster, for about $30 or $40 bucks a week, that could easily be most of your protein right there.