Mine was issue 28 way back in like 1983-84... my mom got it for me.
I rushed to the store the next day and found issue 27 behind the stack of 28's.
I've been collecting them ever since.
It was hard sometimes, when we moved I always had to find a store that sold GI Joe comics. Then Special Missions came out and the yearbooks were always a challenge to find.
I remember one day GI Joe Vs Transformers came out, I didn't have a dime on me, and my parents were flat broke. My brother in law pulled out a handfull of quarters and let me have them.
It was hard but I never missed an issue until #143 for some reason. But I found it on Ebay a few years later.
Sold that collection and am now working on getting a new one built back up.