My trainer Cristina has been really working with my back. So that I could do a little work on my own, I got a foam roller back in September.
Recently, my back had some extra pain, and Cristina introduced me to the massage ball. She was using a lacrosse ball the first time I tried it, but the next time, she had a ball made specifically for massage purposes. It felt good.
Cristina said she got it at Ross, so when I was there a couple days ago, I looked. And I found one! Yay! It will join my foam roller in the living room.