Some years ago I bought a shoulder massager @amazon as I often had neck / shoulder pain. Well today I found out that this nice massager can be also used for the chest, lol. 
You just need to wear it the other way round and voila, you have your own breast tapping massager with heat. It fits perfectly! I tried it today and I love it! I don't put it on the breasts directly, I place it above the breasts (top part of the breasts, not the nipples) and enjoy.
It has 20 different massage programs and 10 intensity levels to suit your needs.
This is the device: tapping massager
You just need to wear it the other way round and voila, you have your own breast tapping massager with heat. It fits perfectly! I tried it today and I love it! I don't put it on the breasts directly, I place it above the breasts (top part of the breasts, not the nipples) and enjoy.
It has 20 different massage programs and 10 intensity levels to suit your needs.
This is the device: tapping massager