I was on the Barnes and Noble website earlier and came across the soundtrack to KH2. Apparently it was realeased in June 6th, 2006. The cost is $41.38 for members and $45.98 for non-members.
http://music.barnesandnoble.com/search/product.asp?z=y&EAN=4988006203013&itm=8
http://music.barnesandnoble.com/search/product.asp?z=y&EAN=4988006203013&itm=8