In the 1980s most consumers purchased their computers from Radio Shack. It was pretty much the only store in town that sold computers and computer parts.
Obviously the retail market got crowded as the computer industry took off in the 1990s and 2000s. Today consumers can purchase their computers from various sources including online. Not only is it easy and cheaper to buy computers today, but the technology is much better.
As mentioned in a 1999 promo at MacWorld; today's computers break the laws of physics, they have more features in a smaller box.
Download a page from the Radio Shack 1988 catalog featuring the Tandy 1000sx. Its hard to believe how much computers have changed in just 20 years. Just imagine what the next 20 years will bring.