Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (515.99 USD): Email5
Coupon (515.99 USD): BGAFF10OFF
(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): 424BG584, BGX4PRO5, BGX4PDDD, Wholesale20, BGFFX4P, BGJX4P7, aff7off, BGJX4P34, BGJL3D10, BGJPX4P11, BGJPX4P717, BGXJ49034, affiliate6, BGJUX45504, BGJUPP100, BGJUX4P100, BGJUX4P1001, BGJUX4P2, BGJUXP1, BGJUXP2, BGJUXP5, BGJUXP6, BGJUXP7, BGJUXP8, BGJUXP9, BGJMX4, BGJMX5, BGBFCR28, BGCITYADS2019, BGJLP1, BGJLP2, BGTT10
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Jumper EZBook X4 Pro 8/256GB i3-5005U Notebook is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).