Almost all that I can find were purchased by Tom Yeary, owner of the
Timeshare Store, and the last one was in 2008.
On the Orange County web site, search for deeds where the grantor is "ORANGE", put "-DISNEY" for "both parties" and set that to "wildcard search" and then on the second page of criteria put "DISNEY" in the legal remarks field. Then uncheck the "Uncheck to search specific document types" box and select "Deed" as the document type.
I get 98 hits. Some are clearly misfiled, and are not a Disney property at all. A bunch went to Thomas Yeary. Some went to Palm Financial, which is Disney's financing arm. Some went to Baker and Hostetler, which is Disney's law firm. There are a couple where it was bought back by the people who owned it originally. That's about it. There might be one or two others where someone else bought the property.
I would guess in a lot of these cases, there is money owed on the property that is worth more than the property itself, so the only entity interested in bidding on it is Disney. Those are the ones that are transferred for the minimum price to Disney or Palm Financial. The ones where the property is worth something, I would guess there are a few people who are willing to bid it up until it hits a reasonable resale value, and then Disney overbids and takes it.
It's almost always going to be worth more to Disney than to a reseller, so I doubt there are any screaming deals to be had. If there were, Tom Yeary or someone else would be snapping them up.