I can get you Metzeler Tourance, Bridgestone Battlewings, or Bridgestone Trailwings. Between 2000-2500 for a set. My F650 uses the same tires and I generally buy 3 sets per year in the Guangzhou motorcycle market. BG Performance is a good source for tires, but they usually cater to the sportbike crowd so you have to wait a while to get your order. The concrete roads are devastating on tire life, prepare thy wallet.

Also might be worth making friends at BG as they are probably one of the only shops in China that know how to correctly mount and balance. I do mine meself.

Cheers!
ChinaV