Regarding the 3-D origami pieces by Jun Mitani, I would like to add that he has a couple of books out in Japanese. You can see them here:
http://www.amazon.co.jp/ふしぎな- 球体・立体折り紙-三谷-純/dp/4576091611/ref=sr_1_1?s=books&ie=UTF8&qid=1350572512&sr=1-1 http://www.amazon.co.jp/立体ふしぎ折り紙-三谷-純/dp/4576101730/ref=sr_1_2?s=books&ie=UTF8&qid=1350572512&sr=1-2 That said, I'm not sure how best to get them in the west, other than perhaps trying to order them through Kinokuniya in New York. Andrew Dewar
