Inner Mongolia Grasslands Trip, Any Chance of Renting Dual sports and maybe a guide?

My younger brother is coming to visit and we want to do a 5-6 day trip thru the grasslands. We are thinking some camping and such but i dont want to buy 2 bikes for us to ride is there anything out there to cut down on the expense, rentals and such or groups that do such a thing?

Some time ago I've found this: http://www.v-66.com/motor-1.html
but its like 2 times more expensive than renting a car. 500 per day if I'm not wrong.
But your brother would need to have a chinese driving license.