In the USA, Tandy’s electronic division was Radio Shack. The Tandy side sold leather crafts, kits. I purchased & sowed 2 moccasins kits, and a leather wallet. The Tandy Leather somehow survived the bankruptcy.
https://www.tandyleather.com/en/When the TRS-80 came out I walked to the local Radio Shack for its introduction. There was someone from the HQ doing a demonstration. I believe it cost $599 and came with 1K of ram. You could buy additional RAM for $100 / 1K, up to 16K. I wondered to myself if I could ever one day in my life afford a computer with 16 K of RAM. A few weeks later I was able to sit down in front of a TRS-80 and play with the Basic. I went through entering a little program. I asked the salesman how do you save the program? He said you don’t. So every time you wanted to use the computer to do something you had to retype the program in. Later on someone came up with a hardware hack to add a $20 audio tape recorder to store programs on. When Radio Shack started selling the “Digital Tape Storage” accessory I think they wanted $60 for it.
I asked when the prices would come down, he said he didn’t think he’d ever get cheaper, but they would be able to do more for the same cost.
For electronic kits we had Heathkit, our neighbor worked at Autonetics in Anaheim wiring on guidance systems for the military. He had built the top of the line Heathkit HiFi system. Just before stereo came out.
I built one of their little multimeter about like the one you bought from Tandy. Also built an automotive engine analyzer, that I might still have. It was basically a multimeter with a shunt for testing batteries.