oh aright so yeah it is almost double. Aright then it's not an insanely suspicious cheap deal, not for here anyway. For you that is indeed one helluva price difference, basically half that of what it normally should be.
Well like I said, I'd advise getting some pics of it so you can see the CPU which has writing on it which will tell you what it is.
It'd say like AMD3200+0438 right across the top