Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood.
Link: Banggood product page
Price: -3 USD
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGeb8a90, Cityads2213, BGc0ac93, BG7f43dd, keyboardMVC, Cuponation9
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Feker 35Pcs Mechanical Keyboard Switches.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).