I used some Prosero.US patches for my shoulder pain and my experience is a great patch to use. One thing important is to put the patch to the right place. I put the first few patches right on the shoulder, and didn't get much result. Until I read it on the Internet that some shoulder pain actually comes from the back (the shoulder blades). The effect of the Prosero patches turned out great after I put it to my shoulder blade.
There are a few places you can buy the Prosero patches from on the Internet. I haven't seen it in any local store. You should be able to find one easily. But the prices vary a lot. Give http://www.prosero.us
or healrpatch.com a try. Both are the same, just different prices.