Aliexpress
Click here… to search for Lenovo P8 3/16GB Tablet Deep Blue on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
Coupon (148.79 USD): aff7off
(CouponsFromChina.com tip: you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): 64bc68
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for Lenovo P8 3/16GB Tablet Deep Blue.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).