I really wanted a ZX-81, and my dad ordered one not long after they came out. But typical for Sinclair, the delivery lead time was on the order of months! Not even weeks or days, and my dad gave up and brought home an assembled Acorn ATOM that one of the techs at the university has soldered up from a kit.

Great little machine, and introduced me to programming in ATOM Basic and 6502 assembly, leading to a career in computing that's still going 30+ years later.

Oddly enough, I just ordered parts from Mouser to build David Johnson Davies' Tiny Lisp Computer 2, ... DJD being the author of ATOMIC Theory and Practice and Practical Programs for the BBC Computer and ACORN ATOM.