How can I add "buy now" links to artists/albums/songs on my website?

My in-browser music player application is coming along nicely, and now I’d like to add a feature that allows you to buy e.g. the album one is currently listening to, preferably with me getting a cut :) However, it seems like for Amazon’s affliate program, you have to be located in the US. Does anybody know of an online music store that targets international customers and affliates?