Probably easier to find an old Macintosh with a MMU if you want to try out NetBSD on something of that vintage.
On either 68k platform swapping out a full 68030/040 instead of the EC versions is quite easy, and these chips are still fairly available on the used market.
The USA (as far as I understand it) had lots of 68K Macs in their schools, where as the UK had more Acorn Equipment (which gradually moved to x86 through Research Machines)
Maybe in the US, but definitely not in Europe - unless you also count modern Macs ;)
The other NetBSD machines around here are a Cobalt RaQ (MIPS), a Jornada 690 (SH3) and a Mac mini G4.
Now that there's an OpenBSD port to POWER9, though, NetBSD has no excuse.