I don’t know if this is an official holiday in China or a manufactured sales day just for tablets. But all of the tablet vendors are pimping a double-12 sale that takes place tomorrow. Such discounted prices are never passed on to users outside of China who order through middlemen, however.
The above graphic is from Teclast’s pimping of the sales day.
Mike Cane’s xBlog 
On 11/11 you could get some good discounts for tablets on Aliexpress… Teclast X98 Air 3G was available for 180USD (normal price is 200USD) for example