This may not be the cheapest computer available, but it has all the basics, and still has a parallel port. $10 shipping
http://www.pacificgeek.com/nooner.asp?P=SS
almost the price of a MOBO

I don't know if I'm sold on the idea this running the engine yet. It would definately need to have the HD upgraded to SSD, then a powersupply for aircraft use.
Anyway FYI

Craig Smith