Where can I get a copy of Clipper Summer '87?

 Any other versions prior to 5.3?

 Generally, nowhere that you can count on.  The best advice is
 to watch forums, bulletin boards, and the newsgroups for offers to
 transfer a license on a new or used copy.  Neither CA
 nor its major resellers is selling Summer '87 anymore.

 For the record, CA does NOT allow free use of Clipper Summer '87
 on the same CPU for which CA-Clipper is already licensed.  You
 really do need to scrounge a copy of Summer '87 to be legit.