Aliexpress
Click here… to search for PPTV KING 7S 3/32GB Silver on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (99.99 USD): BGPAYPALSS
Coupon (102.29 USD): aff7off
Coupon (103.39 USD): affiliate6
(CouponsFromChina.com tip: apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Old coupons (from the oldest to the newest): BGPPTVKING8, 11BG7S, 1225CAR
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for PPTV KING 7S 3/32GB Silver is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).