Making seitan from scratch is super cheap! Just buy vital wheat gluten in bulk at a food coop or whole foods and experiment with it. It may take a while to get it how you'll like it, but once you do you can do so much with it! Also t.v.p is cheap and you can make burgers and chili and things like that. I've been vegan for several years now and it seems like making things from scratch is the cheapest way to go, that and making lots of stuff at once and freezing it.