After reading Lyall's tip about an ice pack I thought I would pass on a tip for a cheap do it your self heat pad that Ma showed me.
Take an old sock (no holes in it) I used heavy cotton one,fill it with rice and tie it shut and your done.
To use it just pop it in the mircowave--time varies by size--I start with 10 seconds then check it and give it 10 more until it's the temp I want.Don't over do it or it might burn.Once you get the time figured out it's a snap to use and it will never wear out.
A lot of you may have heard of this.But for those of you that haven't,give it a try. Bill