Freecycle here is voluminous with many posts.
fyi
For muscular skeletal problems I use what I call hydrotherapy.
A hot, on the verge of feeling cold, throbbing handheld shower spray is directed at the area of concern. After a week of treating a shoulder with an 8 or 9 nauseating pain, a small click was heard and now the shoulder only feels slightly sore without pain. Three minutes is a short treatment and 15 minutes is a long treatment once or twice a day.