There's a decent amount circling around amongst private collectors. The good ones go for a pretty penny too! I run a used retro games business, and will regul

There's a decent amount circling around amongst private collectors. The good ones go for a pretty penny too! I run a used retro games business, and will regularly sell stuff like a C64, Amiga, IBM Clone or SpectraVision to one particular group on Facebook for $200+ in as-is/untested condition. The rare stuff goes for even more. I recently got $300 for an old Atari ST floppy drive. The guys that buy them will often do things like de-yellow the plastic and change all the caps, and there are even new upgrades being made for many of the old PCs today (HDMI mods being a big one). In terms of where they come from, I know that some of them make their way back from overseas e-waste (there's one guy in India in particular I'm thinking of that does junked Game Boys and vintage toys too), and there are plenty just sitting in sheds covered in dust.