We have a pair of the Sennheiser HD500A headphones used for that type of therapy that we are not using. The headphones run in the $140 range. I know we could just use them as nice headphones for listening to music. But I first wanted to offer them to anyone that might need them for this type of therapy. As we all know therapy is expensive. edited to add: not trying to sell the headphones but give them to anyone that could use.