Big Cartel (https://www.bigcartel.com/) is a website that some artists use to sell merchandise, including physical copies of their music. (I do not yet know if they offer digital downloads as well, but I doubt they do.)
Example artist-level URL: http://www.musicofjunior.bigcartel.com/
Example release-level URL: http://www.musicofjunior.bigcartel.com/product/juniorland-ep