The Timex/Sinclair sold for $99 us and was clearanced for $19.95 !!
I have seen a few at flea markets or yard sales.
All you need to make a Times/Sinclair USEFUL was an external keyboard,ram add-on,etc.
I used to laugh at the people buying $300 of accessories to make their $99 computer actually do something.
Z80a was a neat chip,though.