Amazon.com: D-Pad + ABXY Conductive Film Metal Sticker Metal Dome Board Button Electro Set D Pad Button Dome PCB Board Repair Part for Nintendo 3DS : Video Games
PCB BUTTON PAD Resources - EasyEDA
Button Pad Hookup Guide - SparkFun Learn
Printed Circuit Board Pads for Metal Domes | Contact Pads by Snaptron