Has anyone here ever heard of these guys and if so, are they legit?
http://www.oemprospect.biz/index.html

Not legit.
You cannot purchase windows XP for that price anywhere - legitimately.
Also, it may be XP home edition, with a cracked serial number.
You'll never pass the windows legit checks.

I agree, The price is to good to be true which usually means its pirated/Grey market etc.