The issue is that for items not sold by shops, there is no information stored on their source. For example, if you look at the fact box for Item:Green mosaic tiles, you'll see there's no "sold by" or anything else for it. The current item template does not populate a semantic property except for stores. I did this on purpose, because of the vast and varied nature of non-shop sources.
My advice is to use the "festival item" properties to limit the table to the commonly available shop jugglies. I imagine this table will primarily be used for people who are looking to upgrade to the next step and so the commonly available ones will be the most useful. -Moderator Caraamon Makdasi(talk) 18:12, 18 June 2010 (UTC)