My DD really likes that movie, so I'm always good at noticing any locations that have merchandise.
The ToT gift shop has a lot, plus the villian shop in MGM (just up the road from ToT, toward the entrance). We found quite a bit in World of Disney in DTD, and I think there was some in the cart outside Haunted Mansion.
I've never seen Jack Skellington (or any of the NBC characters) out for meet and greets though.
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