Prima Guides at GameStop - Fallout 4 ($5), Skyrim SE ($15), Witcher III Complete ($15), ++MORE

Yes, we all know you can just Google everything. Some people still like having these things though.

May not be accessible from outside North America.

Same problem with the achievement guides - I don't remember the game but there was one when you just looked through the achievements it spoiled plot twists by it's name :D

I'm not into printed game guides myself but I can understand the appeal.

There are completionists who play through the game purely for enjoyment first and then play it again for completion (achievements, alternate endings, easter eggs, etc). For these people a printed guide provides the convenience of not having to Alt+Tab (or Shift+Tab) out of the game every time.

Also there are games where it's so easy to f**k up when you make a wrong choice or move, and sometimes you will only realize it way further down the road and there's no way to correct your mistake except reloading from saved game (if you know exactly where you messed up and an earlier save still exists) or starting a whole new game. One such game that comes to my mind is Fallout 3.

Would it also work as a coaster for mugs with hot beverages like tea or cocoa?
I guess if it's hardcover it should be fine...

Can't say I have ever been there but I understand you have a place called Game instead, which I would imagine is similar.