Aliexpress
Click here… to search for Ajazz K870T PRO Mechanical Keyboard 87 Keys 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 (73.91 USD): BGcf924d
Coupon (78.95 USD): BG589b2e
(CouponsFromChina.com tip: this code has to be applied 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): BGc0ac93, BG53623f, BG0866e1, Cuponation9, BGKBandmos12, BGff5312, BG3dd49f
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for Ajazz K870T PRO Mechanical Keyboard 87 Keys.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).