Simple USB Buttons Using an Adafruit Trinket M0 - Hackster.io
The configurable USB push button in an extremely robust Pilstaster design, 149,0
USB Push to Talk Button | Steering Wheel Push to Talk Button
I/O Switch/Push Button Board - 8 push-buttons/slide-switches/LEDs for Ether I/O 24 & USB I/O 24 ($37.66) : Saelig Online Store
Amazon.com: Switch On Off USB Power Extension Inline Cables Male to Female with Low Medium High 3 Bands and LED Indicator and Push Button for Driving DC Lamp Fan Strip Light AnyBack