Keep in mind I am in Canada with a different division, and in 2005 or so completely split from Radio Shack. The Canadian coportate head was called InterTan (and still might be). When RS split, Circuit City bougt them, and they changed to The Source. when CC went under Bell (yes the phone company) bought them.
Many towns like ours have affiliate stores which carry their own product lines as well as the InterTan supplied ones. Our town as had the same affilate owner since at least 1980 in various locations downtown.
When? Before I was 10. IIRC our local mall had an RS store, and Dad and us went there to get wires to extend his stereo speakers outside, so we could listen to music when we polished his truck. I conciously went there on my own after 10 years old.
Catalogs? They were always free, and came out in September. I remember one year or two they had "parts and tools" in a separate catalog. Intertan corporate stores sold "surprise" boxes of (usually discontinued or overstocked) electronics parts, which were sometimes a treat to get sometimes, if you could find them. Affiliate stores usually don't have them, at least the affiliate store I went to.