I think this guy is crazy making money! Fly to Chengdu, where you at almost every travelagency either get a flightticket Chengdu - Lhasa including permit for around 1.990,- RMB Yuan, or a overland permit, actually these are about 5 permits for around 500 Yuan, which allows you to take a bus or go by jeep overland to Lhasa. And these permits are LEGAL. Don\'t know if the permits you get from this guy are legal. Wish you good luck.