Jack and Sally don't do meet and greets at WDW. They have appeared at Disneyland occasionally for the grand opening of the Haunted Mansion Holiday each year, but don't do much else besides that.
Disney does have some merchandise available from Nightmare before Christmas - the Scary Apothecary store at MGM (on same "road" as RnRoller Coaster and Tower of Terror) has some stuff.
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