If ur friend is in nepal then I would say u buy him a iphone 4 because siri is useless in nepal and its doesn't really come handy. And iphone 4 ko 5meg camera is I think good enough. So try craiglist and u can find it under 400 easily.

If u really hav to get 4s then I would say try craiglist also. The lastest 5.0.1 unlock is out so don't worry about unlocking it. Just make sure u don't buy the cdma one ie. Verizon or sprint. Go for the att 4s.

Best of luck!!