Medium Panel Mount USB Trackpad with Three Buttons : ID 5061 : $39.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Professional-grade Optical Waterproof Mouse with Touchpad-scroll (USB) (Black) | OMWK0C03-BK by WetKeys Washable and Waterproof Keyboards
PERIPAD-504 Wired USB Multi-touch Touchpad Large Tracking Surface for Windows 4049571002187 | eBay
Mini Panel Mount USB Trackpad with Two Buttons : ID 5062 : $49.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Bosto Wired Usb Touchpad Trackpad For Desktop Computer Laptop Windows Pc User Compatible With Ios System Macbook Pro & Imac Pro - Digital Tablets - AliExpress