Found that there were at least 95 issues in this mini-comix series, 1-88 had B&W covers, 89-95 had color.
Also, somewhere in the 80s (maybe it was 89) they made the jump from regular mini size to 8½ x 11" magazine size.
I see that most are still available with #1-4 being sold out. I think I've only got issue #4. Some contain pre-TMNT? Eastman art.
Brad Foster has a web site http://www.jabberwockygraphix.com/ which has many of the goodies. I have 1-88 (I think) but never knew about the comic sized ones. Have to pick them up. I am not sure but I might have gotten the site from here or from Rick's site