The cover of this book immediately brings to mind the term "Quarter Bin" alongside of issues of "Prime Slime Tales," "Grim Jack," "Savage Dragon," and "X-Men Adventures."
As far as the probability of "finding the Holy Grail," I figure if any comic shop acquires this issue unaware of its value, then they'll either look up its value in order to price it for resale or else just inadvertently toss it into a box full of random, unsorted stuff. At least, I could see that as within the realm of possibility.
I doubt anybody would be able to find this with a $5 sticker on it though. That would probably require that somebody actually looked up its value and just proceeded to undersell it without fanfare. So the seller would have to be both diligent
and stupid as opposed to just being either lazy
or stupid.