I went to two different Radio Shacks lately with no luck - once to get a 4-pole 3.5mm minijack to RCA AV cable and another time to get a TOSLink optical cable (again needing a 3.5mm mini-plug on one end.) I realize these are not super common cables, but in each instance the sales people had no idea what I was even talking about.
I also don't understand the whole Radio Shack mobile strategy; I can go just about anywhere to find a mobile phone and pay outrageous prices like theirs. With the whole maker movement, I would think they would sell Arduinios and Raspberry Pi boards. I would also think I could go in there and get a small selection of hardware (motherboards, CPUs, Video Cards), but again, I don't think they have stock like this...