You can buy a
brand-spanking-new IMSAI 8080 that has 1 meg
of bank-switched static RAM and a 20mHz Z-80 (actually Z-280?)
processor for under US$1000. I'd say that qualifies for an
excellent "old" new computer.
First Z280 didn't need bank switch as it had a 24bit MMU. Second if
it has Z280 production would be hard as Zilong endof lifed it some 6
years ago.
Likely is Z180 or Z380.
You're right, it's Z180, I wrote that part of the post before
doublechecking the web page, then didn't edit the earlier
writing.
-dq