Isn't it bizarre how expensive clamps are? A decent clamp costs... $20!?! is it made out of Krell Metal, or Unobtanium? Is there some liability issue involving a simple clamp that I don't know about? Are there people out there mangling their hand with a clamp and then suing the maker? I have no idea.

This website details 2 clamps you can build your self, and very cheaply too. It also shows how to build a nifty drill guide that allows you to precisely determine were both ends of the hole will end up, pretty cool.