Aliexpress
Click here… to search for Xiaomi 90Fun 20inch Suitcase Gray on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
Coupon (155.24 USD): BGTY742TRL
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): TTxBG10, 968f6a, BGOD1, AFfbG10, BGC01834, 502C6B, BGBFAFF2019, BGCITYADS2019, BGTS785, BGTS204, bGhOnEy10, BGdragonBoat, BGTRIP01, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGMX88TS, BGAFF10OFF, BGCuponation10
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi 90Fun 20inch Suitcase Gray.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).