Aliexpress
Click here… to search for Xiaomi HZJP01YM 104 Keys Cherry Red Switch Keyboard on 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 (76.49 USD): bGhOnEy10
Coupon (76.49 USD): BGdragonBoat
Coupon (76.49 USD): BGAFF10OFF
Coupon (76.49 USD): BgcLuBofErtA10
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): AFfbG10, 502C6B, BGBFAFF2019, BGCITYADS2019, BGMPB2020, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi HZJP01YM 104 Keys Cherry Red Switch Keyboard.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).