he wont have too hard of a time, if he buys used. or he searches a long time on alot of forums and may come across a great deal on someone needing to clear out stuff they havent used.
look up these amps:
zx1000.1
kx1200.1
jbl gto1201.1ii
that may give you a decent starting point. first 2 are kicker, second one is a jbl