[JRPGFan]

Golden Sun: The Lost Age Compass:

It looks like any compass you could buy normally with key chain but it's got the logo on the back. Least coolest thing but I can't find anything about it on the net or anyone else having it. Therefore making it the rarest thing in my collection. This and the Dairy seem to be press promos as the person who had them worked in the press.

Runners up are...

Golden Sun: The Lost Age: Germen Poster (square size). Just like the compass I've only seen this version once and haven't seen the artwork used like this officially anywhere else.

Golden Sun Dairy: I've seen only one other that sold on ebay just bit after I brought mine.

Dark Chronicle UK/Pal Poster: I've only seen one other and that was sold in 2008.

Skies of Arcadia Legends: Wooden Sword: Again, I can only find one other image of someone owning one of these. But there was one other mention of someone owning another. Meaning there's at least 3.