so true....
Hard to figure out who's actually building and who's just re-marketing with different plastic.

Here's another one that has a xr250-like bike (looks identical to the one in my previous post) as well as a 300cc of some sort.
http://jutmotor.en.ec21.com/product_..._nm=Dirt_Bikes

And here's another one. the links to the products don't work anymore (they did before), But maybe they'll be up again soon.
These guys also sell the bikes mentioned above as well as dirt bikes up to 450cc.
http://www.asiawing.com/asiawing_004.htm