Taotao just introduced another pit bike alongside the 3 they were already offering; I do believe their DB17 is under $800 including shipping from most places, including my friend Alan at Excalibur Motorsports. Call him and see what price he can get one for, and go from there--909-591-8800. Keep in mind that Alan almost always answers the phone, and that Excalibur is not a discount website with poor customer service. Excalibur's main line is distributing TGB scooters, but they also distribute Chinese product, namely Taotao (Excalibur was 2 miles from Taotao's Southern California warehouse, but sine they moved are around 10 miles). My suggestion is to call him first, and then if you can get a better deal, call other places.
The Taotao DB17 has several videos on youtube and seems to be a stout bike, which is why I suggest it. I did post about their new bike, the DB27 on another thread, but I am guessing it might be more expensive, or, if it will remain lower cost, will replace the DB17.
http://taotao.us/index.cfm/dirt-bikes/