As I recall, it varied. There were certainly relatively cheap Z80 and other machines like the Commodore 64. But I don't remember systems like the Apple III, Epson's machines, etc. being vastly different in price given the same floppy-only configuration.
The first "affordable" PC clones (in Europe at least) didn't appear until 1986, with the Amstrad PC1512 (apparently also marketed in the US as the PC6400):
https://en.wikipedia.org/wiki/PC1512
Much earlier in the US. Most notably Compaq (founded in 1982). But many others. The one I bought in 1983 or so was from a company called Corona. I think Eagle was another.
