I'm anxious to hear what others have to say about this.
I just bought a jade infrared small heating pad off amazon.com for my hip. I've been having some physical therapy done and the deep heat has been the one thing that has helped. I am hoping this new heating pad will help me. The reviews were good on amazon. I should be getting my pad in a couple of days, so will let you know what I think of it.
As you can see, it is pricey, but I can tell you it seems like a very high quality product. I just used it today and I felt a deep heat rather than a surface heat and my hip did seem to respond to the treatment.
I'm not sure what you are wanting the pad for as to whether this would fit the bill or not. They also have a full body one that you can lay on just like this for $279 (I think) where you would get the benefits of the infrared from head to toe.
Hope this give you a little more info than you had before. Good luck finding what you are looking for.