Shop that week's meat specials at your local grocery store. Then use the meat in a way that stretches it further, like with noodles, pasta,casserole, in a hearty soup or stew or chili, etc. Also, look for recipes you can add beans to your main dish to increase the protein without having to depend solely on meat. Otherwise you have to buy enough meat for 100 servings, and that's just about impossible for $100 and also trying to add side dishes. In light of the cost of groceries, perhaps the church (or the families chipping in) should consider a slight increase in the cost of meal. It's not fair to have to make the rest up out of your pocket, especially if you do this on a regular basist.