I got mine through a Team Covenant subscription. For this novella they shipped it with the "Arkham Horror Supplemental" subscription but they have since created a new category for subsequent novellas.
Me too, and I 100% didn't want it. I had thought the supplemental subscription was for extra card packs. A couple of promo cards inside an overpriced fanfic book do not count. They could have mitigated the problem by sending out a "pending shipment" notice, but they never do. They just send a notice that says "something shipped to you, but we're not telling you what it is." I thought this one was the Labyrinth of Lunacy pack. I cancelled all of my TC subs because of it. The packs are cheaper from Amazon anyway.