Comgrow has Amazon returns printers for $69. There are no returns and may be missing a part or two (mine was missing belts and the bed), but if you plan to tinker anyway, the parts are not terribly expensive.
That said, it definitely requires money. You'll still need filament, at the least. You're not going to get into 3d printing for free. Try to get a part-time job. Since it's the summer, ask neighbors to mow their yards for money.
Glad to see James Cameron weighing in because James Cameron knows the people need James Cameron's opinion