A week or so ago, I bought a five-pound bag of carrots for maybe $3. Just boil and then puree those things and add a bit of formula (or B-milk if you are so lucky) and boom! Baby food that is made from real food with no additives, and, umm, way cheap.
I went to a local orchard and got half a peck of white peaches. Give those things a spin and they are good to go in the freezer.
I only put two peaches in there and that made 8 "cubes" of food - he is eating one cube per "meal" right now. We have been feeding him one cube plus a little rice cereal mixed together with a bit of formula. Then he's getting watermelon in a mesh holder for dessert. He is loving the watermelon.