Buy a pumpjack.
Listen here, kid. You go out to West Texas, find a decrepit, forgotten stripper well abandoned by lazy Chevron executives, and you start pumping.You save $15k, buy ONE beat-up cast-iron pumpjack, a secondhand engine, and a rusted-out Ford F-250.Every time that rusted horse-head nods CHUNKCHUNKCHUNK that is CASH blasting out of the dirt!