I think I only have like three strategy guides: One for Super Mario 64 that has seen it's better days (the spine of the book went bad and now it's basically just being held together by a tacky piece of red duct tape) which I believe was done by Nintendo Power but I'm not sure, one for Pokemon Yellow which I am certain was done by PRIMA and one for Twilight Princess.
Gotta say it kinda makes me a little sad to see them go out of business.
I have only one, and it was for Tri-Force Heroes. Kinda lack the drive to get those when you've used the wiki for years before actually owning any of the games for any given franchise.