I bought two Bully Sticks for Diamond, I think they were each $2.99 and she goes to town on them! It's great because she is occupied for at least thirty minutes. She usually has the same one for awhile. They do tend to smell after awhile.
I was a little disappointed because she was at the petsitters just recently and I gave the petsitter one of the bully sticks and Diamond didn't come home with it

Now I have to buy more, maybe I will check the web first