[chr15p]

top500.org for June 1994 lists 79 entries for Thinking Machines which is their high water mark, but it looks like most of those are CM-5s with about 20 being CM-2.

So assuming some of the CM-5s are replacements for CM-1 and 2s I would expect they sold maybe 100 machines total, 150 absolute max across all three models.