Two things that I cook that make a ton and will freeze are baked ziti (or lasagna, ziti is a bit easier on prep), and Japanese curry. Prep on the curry takes a while because there's a lot of vegetable chopping, but cost per serving is pretty low.

Walk down the frozen section and see what they're selling. It'll all freeze well if you make it yourself.

I also enjoy tonkatsu, because it's basically like flour, egg, panko, fry. By the time you've done all that your rice is cooked. Good with either pork or chicken. Tonkatsu sauce is awesome on rice. Leftover rice you can make fried rice out of with any leftover meat.