If you have Americas passport, all you need is board the airplane and they issue a visa at the airpost for $50. Very easy process. But for a greencard holders, they must send application to Kenya and must be preapproved. I got it in 2003 for $400. In this year, I have tried to get one, but it is hard. I was told it costs now $800 now, and even with that money it is hard to find visa...