DVD too, but I think it's pretty much sold out everywhere. The only thing still available on cdjapan is the first press bonus for the
2nd dvd, but that's just some
vocal tracks.
Note that in case it wasn't clear from the previous post, the first volume bonus is just a data CD with the visual novel, not a music CD. There is a
music mode where you can listen to the songs though.
They still have to announce the first press bonus details for Vol.4-6 so maybe they will include the unreleased tracks there, but I doubt.