Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. I can’t find any active coupons for this product in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): Email5, bgshOOp10, 7d18f7, BG94de86, BGLOAC1, 13f142, BG015e8a, BG02c158, Cuponation9, BGa13582, COUPONSDE1wk, BgGoodie9, BG4b2d79
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for LENOVO M10 Plus P22T 4/64GB Tablet.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).