So, what do you buy for the Mario fans who already have all the games? Luckily, Mario is back in a big way this year.

RC cars

• TOMY MicroSizers
  Tiny radio-controlled Mario and Yoshi based on Mario Kart 64 and Super Mario Kart.

T-shirts

• Chasing Mushrooms
• Super Mario Bros. ringer tee

T-shirts, wristbands, pins, patches...
... and more, at Hot Topic. Try searching for:

• Mario
• Nintendo
• And don't forget Donkey Kong

Action figures

• Luigi & ghost
• Mario & Yoshi

Candy

• Nintendo Action Candies
  (I don't think you'll be able to order anything from the site, though.)

Miscellaneous
Two phones and a clock radio. You can't order from the site, but search Google or Yahoo and you'll find tons of places that sell them.

• Mario Kart phone
• Mario phone (voice activated)
• Mario Kart clock radio