For my own amusement I just had a quick look at eBay and it looks like old SUN gear has got expensive since last looked.

NeXT gear has always been expensive, that doesn't seem to have changed.

Sun gear has REALLY jumped in price, especially the early 32bit SPARC stuff. I had a BUNCH of them in the mid 2000's, an IPX, SS10, SS20, Ultra1, and a beautiful full stack LX with CD-ROM and two external hard drives. Sold them all on over the years--now ONE machine is worth more than all I sold combined. I recently had a hankering for another Sparc and settled on a SunFire V100 because it was reasonably priced and I wanted to avoid buying a 13w3 monitor and Sun-Keyboard at the upper price range they are going for. Still a very capable server and it scratched my big-endian itch for the time being.

I first learned Linux (and C) on a SparcStation LX back around 2005 with Debian. I had it fully kitted out with 9.1GB SCSI Hard Drive, 128MB RAM. I sold it around 2011 for $300 and thought that was a lot. Now I see them going for 3x that amount and I wish I'd kept it.

Acorn Electron is effectively a small BBC micro. Lots of fun!