Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (80.99 USD): BGAFF10OFF
(CouponsFromChina.com tip: apply code in your basket (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): BGCPP019, AFfbG10, Email5, BGVDay10%off, bGhOnEy10, BGSS10%SW, BgoFErTaSchInA10, BgcLuBofErtA10
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for AKKO 3108 V2 108 Key PBT Akko Switch Keyboard.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).