Sub Pop's Hardly Art imprint has made available (via Amazon.com) a 100% free digital label sampler, featuring a handful of new and unreleased songs in addition to favorites produced during its first three years including an early demo of the Dutchess & the Duke’s “Back to Me”, a stripped down / acoustic version of the Pica Beats’ “Poor Old Ra” and a live version of Arthur & Yu’s “Magic Mtn”---
This digital sampler is the only place to get these unreleased tracks. I suggest checking out the artists and then picking up their albums from a friendly local record store near you.