The other two I find every few years, but tough in NM as they are just paper inserts.
The Stridex book even came with the letter from Stridex. You had to request a copy thru the mail.
Ive seen it online, but never in person.
I too have found the X-men 1 with Wolverine on the cover at the used bookstore. I didn't pick it up, it was one of those I looked up when I saw it, but it didn't light any fires
I've passed on so much over the years a 3.0 Wolverine 145 Nabisco variant comes to mind, but I thought back in 2016 it was common enough to find higher. I was so new, but it happens, I still think it's cool yall can do something with them