First, look up local laws. I would assume that you would have to be >=21 years old to buy/sell land. I know down here in Florida, you can an acre of land for less that $500. I imagine it's probably a similar situation in your area.
So the best way would just to drive around and find some old, dirt-cheap few acres of cleared land. Look for "for sale" signs.
Luckily for you, the cheapest land will probably be land that is far away from heavily-inhabited areas or highways, which is a win-win. Hell, I imagine that even proximity to the border would probably lower prices, so border-jumper hunting can be a fun pastime as well. Yet another win-win.