Botox in shoulder/neck muscle for relief?

The muscles circled in red indicate problem muscles. They have always been very tight, caused pain, and always feel as hard as boulders. I can’t actually relax them enough to bring them down. Is it possible to inject Botox in or around these muscles to relax them? How much would it cost? And can anyone recommend themselves or someone they know who can help? I live in Atlanta but can take recommendations anywhere around East coast