Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
Coupon (102.29 USD): od7off
(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): BG9432, 9BGZF432, 10BGZF432, 11BFZF4, aff7off
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for ASUS ZenFone 4 Max X00KD 3/32GB Black? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).