KONG Extreme - Black

My English Bull Terrier is 4 years old and he has had 8 Black XXL Kongs. He takes them everywhere with him and he chews them till there is nothing left - only litle bits of black rubber all over the house. We buy them in 3's now since his first couple, so that he always has one around him. Isn't there something that is industructable - its costing us a bomb!

This toy, bought in the right size for my dog, lasted longer than toys usually do, but apparently my dog is faulty and managed to break this one into three pieces too (right where each of the different parts are)... I honestly don’t know what I should buy anymore so he doesn’t destroy it in two days..