Are you kidding, the original selling price of the ZX 81 was $699.99. I bought mine for the $99.99, I think it only has 1k and with the ram pack extension it has 17k. I still have it although due to the membrane keyboard, I don't use it much. I learned machine language programming on this. I also have a Commodore 64. This I still use, I have an assembler (HESMON) that I still dabble with.
Thanks for the walk down memory lane. Upvoted and following. Have a good day.