A limited edition CD release of the B:TAS volume 2 soundtrack has just become available, along with a re-release of the volume 1 soundtrack!
You can buy volume 2 here:http://www.lalalandrecords.com/BTASV2.html
There were originally 3,500 copies of it available, but some were sold at Comic-Con and over 200 were purchased in the last 2 days. It has the music to 21 episodes.
You can buy the volume 1 re-release here:http://www.lalalandrecords.com/BTASV1.html
There were 5,000 copies available two days ago on the day of release but there will be fewer now. It has the music to 11 episodes.
There's also a special offer (until 30th July) on the price of the full Mask of the Phantasm soundtrack here, though less than 300 copies of it are left:http://www.lalalandrecords.com/BatManMOTP.html