As far as I know, there are three ways it can be purchased.
1. On LP as part of a box set.
2. On Japanese CD.
3. On U.S. CD release exclusively at Target.
This article has good info on the releases and the origin of the tracks:
To me, it's sublime. Norah has great taste in the artists she chose to cover! I'm loving it!
I have a friend of mine in CT who's going to get a copy from Target and send it through.