My Mythos journey started at 15 when a friend lent me two books featuring these eerie portraits by John Holmes. (I did return his cpoies) My mother then gave me a copy of The Lurker at the Threshold with a somewhat funky cover by Murray Tinkelman, I am amazed to this day. (Sadly this is not that copy) One could note that two of the three books are primarily by August Derleth, but that is another post. However my love for HPL and the ever expanding mythos was launched.
Lots of books followed including some of the less expensive Arkham House titles. But then other stuff appeared that did not require trips whether real, via mail or finally virtual to the haunts of used book sellers.
There is kids stuff.
There was science!! Sadly this site does not seem to update any longer but there are lots of fascinating posts.
There are comics, graphic novels and these cool editions illustrated by Fracnois Baranger. Some have quibbled with his illustrations for example this depiction shows what might be a human skeleton in the cavern discovered by the member of the Miskatonic University Expedition to the Antartic. Maybe yes maybe no, but really people, why don't we call it foreshadowing and move on. These great books, great illustrations and I hope to discuss them in more detail in the future.
The there are games. My wife and I love collecting and sometimes even playing (actual physical) games. The more cool plastic figures and stunning graphics the better. And Howard is of course included.
Pandemic Reign of Cthulhu. It is produced by Z-Man games who produce a number of Pandemic games. You move around the world closing portals, and fighting cultists, monsters, and elder gods. It is the simplest and most compact of the mythos games we own. The game are relatively short and quite entertaining.