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Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (43.99 USD): BGff5312
(CouponsFromChina.com tip: apply it 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, BG79b6b7, Cuponation9, BGKBandmos12, BGd35b9d
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Royal Kludge RK71 Bluetooth Mechanical Keyboard 71 Keys is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).