Pocket Power: A promotional issue of Nintendo Power given away at theaters showing The Wizard. I still have my original copy; I think I actually have two, but can only find one of them. They're pretty rare today. Mine is about in this condition.
Super Mario Galaxy beach towel: Preorder bonus given away at Toys R Us. I opened mine to display it, but it's never been used.
Metroid Prime disc wallet: Preorder bonus from Best Buy. Simple little Gamecube disc wallet with the Samus 'S' logo on it. I can't even find an image of this thing, so it must be pretty uncommon.
Vintage Blaster Master T-shirt: Got this from sending in a coupon I cut out of an old game magazine and mailed in to Sunsoft. I don't think I ever wore it and I've never seen another one.