Edit -> UK Distributor Site

I won't deny it - I'm cheap, so cheap that I'll make a Heath-Robinson version of owt that catches the eye. Latest is the Rotater - a rehab/prehab shoulder saver (http://therotater.com/)

Like with most problems, the simplest solution is usually the best. I aint got $50 spare at the moment, so here's the Grim up North knock-off...

The Homemadegymstuff 'Woody'

50x25x410mm legs, 3 90deg brackets and a length of 25mm webbing; below a bit o'padding (OK, carpet)

Loosens up the shoulders great, and it also feels looser in the delts and upper lats... Buy one if you can; make one if you can't. Simple.