I have some parts for sale.
i5 Processor with motherboard, 1.5TB HDD and 4GB Ram. I am asking for $400 for the package, still runs awesome, but I upgraded to an i7 for video editing.
I can order you a case, video card, and more ram if you want to turn this into a whole computer, or just take the parts.
I have an older case and power supply I would include if needed, but they are used and show their age.
I also have an older video card that was in the system, an 8800GT, which could be used.