I believe these are the only stores carrying them. We were there end of March and found Pirates ones, Rapunzel and I believe Zootopia.I saw them in World of Disney (toy room, plus one of the middle rooms - I can't remember which one), the shop complex on the Paradise Pier Boardwalk (in DCA), and the Five & Dime/Gag Factory (in Toontown in DL). All the stores that carried them had a pretty good supply, but not a lot of stores had them.
Pronounced like "zoom" - soom soom. It means stack stack in Japanese.
I know we're veering away from DLR, but they did also release a medium sized Oswald this morning on the DisneyStore.com. It's currently sold out online, but it might come back in stock or it might be available at a local Disney Store.
http://www.disneystore.com/oswald-tsum-tsum-plush-medium-12/mp/1398357/1000267/
For those that cannot get to DLR...the Haunted Mansion Tsum Tsums were released online at the DisneyStore.com this morning. They are also available via the Shop Parks App.
http://www.disneystore.com/the-haunted-mansion-mini-tsum-tsum-plush-collection/mp/1402458/1000267/
The PotC Tsum Tsums are also still available online.
http://www.disneystore.com/pirates-...sum-tsum-plush-collection/mp/1399365/1000267/