In 2005, a $50 Disney Dollar bill was released to commemorate Disneyland's 50th anniversary.  These bills are very rare, and it's unlikely that anyone who owns one or more would give it up.  However, miracles happen, and so I'm including this page.

 

Who knows?  You might get lucky.  Just be warned, there are a lot of Disney Dollar pins floating around, and they're not always marked clearly.  Always read the descriptions before bidding/buying.