Okay, I’m several years late to this party but seriously — Nethack for the Nintendo DS.
Offworld Designs sells this t-shirt that manages to blend 2001 A Space Odyssey with Super Mario
Hmm . . . Super Mario Chess set.
Think Geek is selling these Super Mario Galaxy Super Balls for $3.99 each (the catch is their randomized so you can’t order a specific one).
FramedNES.com sells framed NES cartridges like the Super Mario 3 cart below. These go for $79.99