It really is cheap on iTunes. If you don't have iTunes (in which case you SHOULD), it's $13.99 new on Amazon.
I think the cast recording is good. The cast is wonderful, most of the songs really are catchy (including several of the new ones), and the orchestrations are great. The production itself is definitely flawed, but I think it's mostly the visuals-- I really enjoy the cast recording.
In my pants, she has burst like the music of angels, the light of the sun! --Marius Pantsmercy