Aliexpress
Click here… to search for Chuwi VI10 PLUS / HI10 PLUS Keyboard Case on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (32.22 USD): TECH8%
(CouponsFromChina.com tip: apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop)
Price history and price alert
Do you need price history chart (for all/most countries) for Chuwi VI10 PLUS / HI10 PLUS Keyboard Case? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).