No monitor or OS but this is everything you need for $199
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3986411&CatId=2358
Intel mini-itx proc pre-mounted. Can you imagine building a new PC for $200 just a year ago? No dual core, no PCI express, but you prob won’t need that in a $200 PC.
Oh, and it makes a perfect candidate of OSX x86 :)Here’s a helpful guide that can walk you through any kinks should you choose to try this out.