Actually I remembered I do have some of the early zines collecting the 1st 24 pages or so of the 1st volume in some stores, so if that's what you've got it's not that surprising, lol. Anyway glad you enjoyed!
I'm even more surprised than you! I haven't sold any copies to comics shops. I guess they bought it 2nd hand from someone who bought it from me. Thanks for purchasing it, I hope you enjoyed it! And yeah, as you saw, I'm selling the whole story in print volumes now.