I recently purchased this floppy turtle-looking device from my favorite hippie spa* in the city, Earthbody. It is an oversized, oddly-colored shoulder wrap that you warm up in the microwave and wear like a little turtle shell. It has some lavender and peppermint to it, and feels like a good hug from someone you don't want to punch.
It also has some weight to it, which is really nice if you're hunched over a computer all day; it will force your shoulders down to a more natural position.
Review of Spa Comforts Should Wrap: 10/10, especially at that $19 price point.