Pololu - Mini Pushbutton Switch: PCB-Mount, 2-Pin, SPST, 50mA (5-Pack)
Using mini Switch Button with Raspberry PI and Python
20 Pcs 6 mm 2 Pin Momentary Tactile Tact Push Button Switch Through Hole Breadboard Friendly for The Panel PCB by QTEATAK : Amazon.ca: Tools & Home Improvement