I should add - even drug stores seem to carry a stock of RCA cables / adapters / telephone batteries etc. Why even bother with Radio Shack anymore.

Online retailers, of course! Sparkfun, Vetco, Jameco, etc come to mind for most of my Radioshack type items that I need. In fact, I've ordered from the RadioShack website 3 times in the last year - During the same period, I've stepped into a RadioShack store exactly 0 Times. Once the stores focused on Cell phones, Direct TV, and Monster cable, they pretty much became dead to me.