Aliexpress
Click here… to search for XTOOL X100 PAD OBD2 Diagnostic Car Scanner on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (442.76 USD): BGAUTO22
Coupon (479.22 USD): 8wEbgaInS5
(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): BG14330, BGHRepair2, BGS14329, BG10OFFAFF1, BGa9ab1e, BG6f6f80, BG43ad03, BGRepair63, BG219177, BGe2914c, MVC8SPRING, 8BGwbg2204
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for XTOOL X100 PAD OBD2 Diagnostic Car Scanner.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).