Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (105.59 USD): BGcf924d
(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): keyboardMVC, BGc0ac93, BG2b5fa0, BgGoodie9, BGKBandmos12, BG67080a, BGff5312
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Ajazz AK816 Mechanical Keyboard 81 Keys.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).