Is There Any Boots That Are Not Uggs But Look Like Them?

I recently heard that they KILL the sheep to make the sheepskin in Uggs!! I want to find an alternative pair of boots that are exactly like Uggs but not made of sheepskin, so I am not supporting the killing of sheep! Please tell me if there are any good sites or stores that sell fake Uggs that don’t have sheepskin! Thanks!