On Wednesday 31 December 2008, Jules Richardson wrote:
  I have no idea where I got mine from; a lot of my junk
micro parts
 were scavenged from an old phone exchange, which was an interesting
 beast - lots of Z80 support chips, but a totally different CPU*. It's
 possible that the Z8 might have come from there too. 
It's possible that it's also a Z8000 (the 8002 MMU-less version
probably); I picked up a pile of telephone switch stuff that was full
of Z8002's.
Pat
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