Radio Shack always had a nerd section, sometimes whole back walls, sometimes just a little alcove. Filled with all the semiconductors, motors, parts and gizmos one could ever need to build, mod, or fix anything electronic. And a fat catalogue filled with even more. And, golly gee whiz, don't forget about their awesome Battery Club!
It all went to hell after being bought out by Circuit City and The Source. Useful electronics tools and components gave way to flashy displays of cellphones, mp3 players, bad laptops, worse tablets, and overpriced RC toys. No more soldering irons, hardly a single roll of speaker wire to be found. Still got some batteries, although they cost half as much at Wal-Mart.
I don't mourn the loss of Radio Shack. That was all done with a decade past.