As noted, and as my experience confirms, there are often (not always) shelves of drawers in the back of the store, along with hanging larger parts like circuit board and the like. The selection is really pared down from what it was only a decade ago. If you want a larger selection, you either have to find an independent store (In Boston we’re lucky to have You-Do-It Electronics), or order over the internet. Sometimes both – when i wanted supercapacitors, I was shocked that You-Do-It didn’t stock any. Radio Shack sure as heck doesn’t have them.
With Radio Shack rolling up its parts list and chemistry sets disappearing, I have to wonder about the future of home science labs. Heck, I grew up with hand-me-down science kits from my cousins, and books of how-to-do-it science from stores and libraries (which seem to have disappeared as well. Along with the bookstores). What do kids today have? Radio Shack still had home electronics labs, so MilliCal got to build stuff there. Bit Chemistry has been reduced to perfumeries and goop science.