I used to have one of these Sinclair ZX-81 computers. It plugged into the TV, allowed you to enter programs in BASIC, and save and load those programs and others via a cassette tape recorder.
It was a computer, and it cost .
I had two of the 16K memory modules that plugged into the back. They shorted out more often than not and crashed the computer.
I even subscribed to a Timex-Sinclair-related magazine that offered programs you could type in. Most didn't work. Maybe it was due to typing errors on my part, but you never know.
I eventually put the whole lot into a box and sold it off at a garage sale.
Maybe not so curiously, I think we should still be able to buy computers for . You sort of, kind of can do that.