Cherry MX Mechanical 4-Key Tester: Blue Black Red Brown Switches : ID 4974 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Rk Royal Kludge Mechanical Keyboard | Mechanical Keyboard Switch | Royal Kludge Keys - Mice & Keyboards Accessories - Aliexpress
Source 104/105 Key Mechanical RGB Gaming Keyboards Backlight,red/blue/brown Switches USB Wired Keyboard With Wrist Rest for PC on m.alibaba.com
What are the differences between red, brown, blue and black switches in a mechanical keyboard? Which one is preferred by gamers/typers (in terms of performance)? - Quora
Blue Switches VS Red Switches VS Brown Switches | Mechanical Keyboard Comparison - YouTube
Keychron Mechanical Switch
61-Key Wireless Mechanical Gaming Keyboard, Blitzwolf 60% Hot-Swappable Dual Mode, Customizable Large Onboard Memory, Full RGB Backlight,Red/Blue/ Brown Switch - Walmart.com