I have just checked coupons. The lowest price I could get is 49.99 USD for K66 Mechanical Keyboard (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Latest price update (UTC time):
Banggood (49.99 USD)
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update. Good or bad price? Pretty good price – average (56.23 USD) is higher than current one!
Link: Banggood product page
Price: 49.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGCNK66, BGAFF10OFF, BGCuponation10, BGHONEY2110, 13f142, BANGGOODSD, BG8dce75, BG304e52, BGraton, Cityads2213, BGd24ee4, BGc0ac93, BG5af78b, keyboardMVC, BG1349e8, BG647afb, Cuponation9, BGKBandmos12, BG980ae5, BGff5312, BG3dd49f, BG22b36b, BG589b2e, BGcf924d, BG081046, BG169788, BG60f1e1, BGCAPITALOS8, BG2e1e2b, BG6c4855
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
Click here… to search for GamaKay K66 Mechanical Keyboard Gateron on Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for GamaKay K66 Mechanical Keyboard Gateron.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).