If Universal doesn't do them ~ the Holiday Inn Nickelodeon Suites will be doing them starting Memorial Day weekend. I don't believe you have to be a guest staying there to book one.
Try giving them a call....they are located of SR536 just outside WDW.
If you are going prior to May they have a character greeting in their lobby from 3-6pm daily. Dora is usually there. We were visiting friends there a few weeks ago and the hotel staff didn't even realized we were not registered guests.