The Black 6 is incredible.
Best scene is when they go into a bar that doesn't serve them, and they proceed to beat everyone's ass and literally break down the building.
Edit: This is a fairly common $1 DVD. I've found copies at Wallgreens I think, and a few other places that have bins of dollar DVDs. Also, if you have one around you, National Wholesale Liquidators (
http://www.nationalwholesaleliquidators.com/store-locator definitely stocks this movie, but it comes in a cardboard sleeve.