How I started. Once upon a time there was this magical kingdom called Radio Shack. But it's people left the Earth and went to Capacinor - the Unshorted Lands, a place where batteries are always charged and every circuit board has a schematic.

Nowadays there is Pololu, Robotshop, Sparkfun, Adafruit, and Battery Space. Maybe Microcenter, Ebay, and Temu.