I think they sold a bit of Big A stuff in my local Wal Mart in the 80's. My Wal Mart had a parts department back beside sporting goods. They didn't have EVERYTHING, but they carried belts, plugs, common Ford/Chevy alternators and starters, brake pads, u joints, points and caps. Stuff like that. Pretty sure points and caps etc were Big A
Only competion was an old Western Auto until about '88
We got an Autozone about that time.