I built mine with a rotisserie motor
A 2"×8"
Four r12 bearings . Counter sunk and glued them into ends.
Two pieces of 3/4" stock, turned one end to fit in motor. 3/8" dia. Then square cut.
Cost me 26 dollars for motor, the rest I had laying around, I would think all new $50.00 would be max.
Mine takes roughly 7 min per rr tire revolution. http://m.lowes.com/product?langId=-...Id=3318308&store=1151&view=detail&nValue10356
I built my own very similar to Oldschool00, went through a couple motors, then I bought one from Griffin Kinsey at Rebel Fabricators 706-618-9801. I can't remember exactly, but it was around $120. Save yourself some grief and buy that one.