To buy the official goods you can try here:
http://shop.fujitv.co.jp/daiba/shopp...e.asp?B_ID=498
Or try to do a search on Amazon Japan.
As you'll see on the fuji TV site, there is a DVD but I don't think it's of the show itself. I believe it's an interactive DVD (proabably region 2). There aren't any official DVD releases of the show. Very few Japanese game shows have them (much like in the States).