We still have Radio Shacks in our town. I guess some stayed independent.
When I was little, my dad took care of anything electrical at our home. He was an electrical engineer, and even worked for Bell Labs in New Jersey in the 50's. After my parents divorced, my brother took over the electrical household projects. He started working at electronics stores at age 16.
Yes, there's still tons of them in the USA. I was surprised to see how many there were in Los Angeles. Just as common as Starbucks.