indiestore as yet does not have its own widget configured so that you can get your music on your profile directly.
But as luck would have it there is a work-around.
Some clever people have created another application called My Stuff. This application lets you paste your widget code in and display your indiestore widget on Facebook.
We've thrown the recommends player on a small indiestore Facebook page to demonstrate.
http://www.new.facebook.com/pages/indiestore/6774923589Andrew.