You can get 35Pcs Gateron Pro 2.0 RGB SMD Keyboard Switches for $14.99 with coupon (from Banggood). Price history, coupons and price alert are available on this page. Let’s see what best price is ATM.
35 Pcs Gateron Pro 2.0 RGB SMD Switches Yellow Red Blue Browm Pro Switch Pre Lubed For MX Mechanical Keyboard – Black Switch
Latest price update (UTC time):
Banggood ($14.99)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? Price? Well, this price is higher than average price ($10.99)
Link: Banggood product page
Price: $14.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for 35Pcs Gateron Pro 2.0 RGB SMD Keyboard Switches is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).