Yahoo! Japan is currently hosting an auction for a set of nine authentic Rockman animation cells, each used throughout the production of various "animated" projects such as Japanese TV spots. Additionally, the cells also served as reference materials for the creation of various "overseas promotional" goods.
As of this writing, the auction is currently running at 27000 Yen ($300 USD)! If you're willing to drop that much (plus the additional proxy fees), go for it.