For those who have already gotten the game, I just want to say I found something awesome. It's only in the Lookout Cabin at the beginning of the game, so it's hardly a spoiler.

The item is a storybook called "Sun Saga 1" hidden in a shelf that is basically a children's-style re-telling (with pictures) of the first Golden Sun games. It's on the first floor.

It's very, very cute and adorable and I just wanted to make sure everyone finds the book and reads it because the item is kind of hidden. The book only covers part of the Golden Sun story though, but there's obviously more "Sun Saga" books hidden throughout the game. If you find anymore Sun Saga books, make sure to post where you found them here so we can complete the set!

I haven't gotten very far into the game, but I have found two so far. I found my first one in the same place you got yours, and there's a second one that can be found in one of the bookshelves of one of the houses in Patcher's Place. I believe it's one of the southernmost houses.

I got the second one in the northwest most house of Patcher's place.

Edit: 3rd is in passaj in the meeting hall.

I just discovered that Sun Saga 2 is being sold in Passaj as an artifact (from the medicine dealer). Maybe because I never got the one in Patcher's Place?

Volumes 3 and 4 are also bought as artifacts (later in the game).

I got 5 from artifacts later on. the other 4 I found.

I found Sun Saga five in a bookshelf in Kolima.