Aliexpress
Here are coupons that you can use.
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Alldocube KPad T610 4/64GB 4G 10.4 Inch 2K Tablet [EU] (-3 USD)
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong. One coupon is available. Cool!
Link: Banggood product page
Coupon (129.99 USD): BGe311c9
(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): 6GSGIT, BG60d666, BGDBKPAD, BGBFALKP, BG69a970, BGc95502, BG921d24, BG9720dd, BG0aabb6, MVC8SPRING, BG870e45, BG483c05, BGc2a8ed
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Alldocube KPad T610 4/64GB 4G 10.4 Inch 2K Tablet [EU] (-3 USD)
Price history and price alert
Price history (for all/most countries) for Alldocube KPad T610 4/64GB 4G 10.4 Inch 2K Tablet is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).