Arcade Button and Switch Quick-Connect Wires - 0.187 (10-pack) : ID 3835 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Working with Wire - learn.sparkfun.com
Common JST Connector Types – Matt's Tech Pages
Amazon.com: GUWARRY 2 Pcs LED Power Cable Daisy Chain JST XH2.54 2Pin Plug to 0.110 Inch /2.8mm Terminals Jumper Wire Harness Lighted Up 20 LED Arcade Buttons for Arcade USB Encoder, MAME,
Connecting Arcade Buttons to Raspberry Pi GPIO Pins — cuddleburrito