if you are a student in china you get 35% off any computer items plus they're all made in china so already 50% off the price we pay here in america... you do the math... if youre a student and can afford computer/parts you can build a 1200mhash rig for the cost a US miner would get not even 350mhash... dont believe me translate commerce pages and convert prices.
a 6870 is around ~140 US... in china is about 70 for a consumer or 55$ for a student...
Oooooh did someone overspend on mining equipment?
The thingy you mention is only in government sanctioned stores selling really low grade crap like android tablets or low-end laptops.
http://item.taobao.com/item.htm?id=10602748589 is one of the cheapest 6990s available @ 734.44 USD it's neither really cheap nor decent, notice the central fan that means you cant properly cool the rear gpu.
http://item.taobao.com/item.htm?id=9563372611 is a fairly normal example of a brad name @ 979.777 USD it isn't cheap in anyway.
Those 6870s you're so hot about go for around:
http://item.taobao.com/item.htm?id=10676020541 @ 203.637 USD feel free to search taobao and get the price you mention.
What we can get here is the occasional junk card and resolder then @ very low prices. I bought a bunch of 5770s @ 20USD but A) had to have components replaced and B) had to cook up coolers for them.
But what you're talking is totally unsubstantiated bull. Get a life or post some proof.
