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 (272.08 USD): 13f142
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): 8ade0e, 1225CAR, d8d0c8, 64bc68, 55dc1f, aff7off, bgchinafest, BGa763d2, Email5, bgshOOp10, 7d18f7, BGCuponation10
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for Jumper Ezpad 6S Pro 6/64/64GB Tablet.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).