[Update: check out our own picture from the showfloor in the gallery below!]
ThinkGeek is realeasing a full replica of Mega Man's Mega Buster cannon for $79.99. It's billed as an "officially licensed Capcom product," and comes with full-on lights and sounds. It's built as a "two-trigger" system, so you can shoot a regular or a charged shot at will.
It's set to ship on December 15th. Keep heading back to the site, as pre-orders are expected to hit any day now.
Mega Man Mega Buster Gun Replica [ThinkGeek]