save your money and let your shoulder heal. Do stretches and full rotations of your arm and shoulder to keep things moving but don't aggrivate your shoulder by drawing a bow if you can't do it right now.

I have a slight tear in my shoulder. I like to shoot year round and my shoulder was killing me for days after shooting 40 or 50 arrows. Went to the doctor and told me to either let it rest or keep being in pain or do further damage and require surgery. (possible miss all of bowseason) So I didn't shoot but a handful of arrows for a couple months and during archery season. Shoulder hasn't bothered me in months.

Now I can go outside with my son or wife and shoot 40 times no problem..