Cheap PC for Linux

[Dennis]

I am looking for someplace locally to get a new or used PC that I can play 
with Linux on.  It needs to be cheap since I can't justify the expense 
right now.  I'd like to be able to run a distro of Linux with all the bells 
and whistles so I can give it a fair assessment, but I can't afford to put 
it on my primary box right now.

I have tried LCC Surplus, MSU Surplus and a used comp store in Okemos.  Any 
other ideas for a good system, don't need a monitor or mouse/keyboard, etc.

Thanks for any help.

Dennis