I've been picking up movies on the cheap from a video liquidator on eBay.
They're TBC Video, and
here is just one of their auctions.
I never bid more than their base price of $1.88. Since they ship the different auctions at the same time, I usually end up spending about $3.00 per movie.
Some titles I've bought: THE BRAIN, R.O.T.O.R., MIRACLE MILE, CONSUMING PASSIONS, HOUSE II, JOCKS, DON'T GO IN THE BASEMENT, DEAD HEAT, PSYCHO COP and SLAPSTICK.
Sure these pithy titles on old VHS tapes don't hold up to mr. henry's DVD selection, but it's cheap and they have what I'm looking for, i.e. pure crap.