The Nintendo Super Power Supplies Catalog, 1993-1995. I think you got these if you had a NP subscription? There was a “stamps” system where you could save on merch. All kinds of fun stuff in here. In addition to the usual branded clothing and accessories you could also get a collection of the awesome Super Mario Adventures manga, and even rare stuff like the StarFox competition-exclusive game pak. And remember those Mega Man X pogs I posted a while back? They made ones for Mario, Metroid, and other series too. And of course since this was the 90s you could also play it loud on your jeans jacket.
Super Nintendo, NES, and Game Boy controller decals from Nintendo Power’s Super Power Club, early 90s
Let’s see what’s inside the 1989 Super Mario Bros Sticker Fun book that I’m using for an icon here... turns out it’s mostly just posters where you’re supposed to use the stickers to color things in, though there’s also “collector cards” and some miscellaneous stickers and activity pages. Fun old-style Mario art, though. There’s even a Mushroom King! I don’t think he ever appeared in a game (unless he was relegated to one of the SMB3 kingdoms).
Also it looks like 13-year-old me had ideas about using some of the stickers to make an ambitious SMB tabletop game, with lots of items and some sort of dice system to battle enemies, though it doesn’t appear to have progressed past the planning stages.