For what its worth, I tried searching with the string "where to buy old issues of Mortise and Tenon magazine" and Danmart77 was the first entry in the list of several dozen. Then tried using Googol and found a AI response along with (among may others) :Their web site has back issues, but they're pricey. They are running a buy three, get one free promo.
Mortise and Tenon magazine
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The earliest issues are out of stock, but you can get volumes 1-3 here:
First Three Issues; Mortise and Tenon magazine