Aliexpress
Click here… to search for Alldocube KNote GO 4/128GB N3350 Tablet With Keyboard on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
Coupon (292.99 USD): Email5
(CouponsFromChina.com tip: just apply this code 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): 9d7431, bgcubekg, BG0933e1, aff7off
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Alldocube KNote GO 4/128GB N3350 Tablet With Keyboard is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).