Promenade au Pays des Illusions is now avalaible for sale at Comic Toranoana’s website:
Not only that, but the book will also be sold in Comiket 81 (Tokyo, from December 29th to 31st 2011). This is a new edition which was translated to Japanese.
Promenade au Pays des Illusions is a Touhou Project fanbook presented by Touhou.net which was released in last Japan Expo (Paris, June-July 2011). Aiwa and Ninamo from C★R were invited to participate in it along with about twenty different artists (most of them from France).