The cheapest one's i've seen are the DrillDo and the FuckSall... but both need someone to run them. Still, i know my Sir would rather be there watching me anyways, so it wouldn't be a drawback for us. They start around $140.

If you already have a Sawzall, or pretty much any type of reciprocating saw, they sell an adapter that is a little cheaper to convert your power tool into a FuckSall for around $100.

i frequent this site a lot, and they have a pretty good selection of fucking machines if you want to know what else is out there: http://www.extremerestraints.com/fucking-machines_48/