They're now selling the ones they showed off at NYCC: http://www.theouterspacemen.com/index.p ... &Itemid=26 The prices are super high, though. I think you could do better on Yahoo Japan Auctions. EDIT: Search for "タコタンク", there's one up there now for only 3,000 yen.
^^ You can buy direct from four horsemen and pre-order the new regular set for retail($40). If they had any of the NYCC sets leftover I'm sure they'll go online soon, I'm not sure if they sold out or not. http://www.storehorsemen.com/