Here's the mouse ears silhouette cutter that they sell at the parks:
http://www.laughingplacestore.com/Product-3069.asp
The ones I have are all from ebay. I have this one coming, I think it's pretty cute, but also quite large.
http://cgi.ebay.com/Mickey-Mouse-Cookie-Sandwich-Cutter-Mold-Mould-Stamp-J9_W0QQitemZ110380769536QQihZ001QQcategoryZ35852QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
These are also very cute, but small, less than 2.5 inches.
http://cgi.ebay.com/MICKEY-MINNIE-MOUSE-COOKIE-CUTTER-STAMP-STENCIL-A04_W0QQitemZ120398061131QQihZ002QQcategoryZ4046QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
A couple more that look good from ebay:
http://cgi.ebay.com/4-VINTAGE-DISNEY-COOKIE-CUTTERS-MICKEY-MINNIE-DON-GOF_W0QQitemZ250413713008QQihZ015QQcategoryZ95123QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/Set-of-2-Mickey-and-minnie-cookie-cutters-NEW_W0QQitemZ360150133528QQihZ023QQcategoryZ38139QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
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