Used atvs can go pretty cheap. Look around for older air-cooled stuff in the 250-300-350 cc range. They tend to be lighter than current stuff and less to go wrong if air cooled. Some of the old 2-strokes had pretty good power in 250 to 300 cc engines.

A 250 to 300cc 2-stroke 4x4 with cargo racks or a 250cc pooaris big boss 6x4 will do a lot, and you're looking at hundreds of dollars instead of thousands. And the 2-stroke smoke cloud keeps the bugs away.