Lol is that really the level of hardware? the guy is trying to rip you off, not only are they second hand, but I wouldn't even pay that money if those parts were brand new.
What am I to do then? buy the hardware over internet? what if it comes damaged? and even without that, I would still have to buy a new OS.
The hardware itself costs about 274, but it comes with preinstalled win 7. Considering that I would buy a new pc altogether, Ill give at least 180 for cpu, gpu and the motherboard, if not more. And where is the PSU, RAM, DVD drive, Sound card, Hard drive, and case?