I looked up Missouri's Department of Conservation tree sales for you. The website is here:
Missouri Dept of Conservation It looks like native trees can be purchased for 30 or 40 cents a piece. That's a lot cheaper than here. They also have guides for how many trees you can fit per acre on what spacing, so it all depends on your intentions. I can't grow trees for anywhere near that price if you count my time.
On myseeds.co, you can buy 800 Antonovka apple seeds for $40.
Myseeds.co 800 Apples trees will cover a lot of ground if you want them to. Or you can grow them in a really small space and graft them once they are larger.
Plums and stone fruit can be grown from pits for free if you eat the fruit anyway, or have friends save them, or pick them from a nearby tree. Many, many things can be grown from cuttings for free. There are so many directions you can go, it's hard to quantify without knowing exactly what you are trying to do.