We are not the people to be asking where to buy clones, denying an honest craftsman his living. Yes, it happens all the time. So do other less-than-honorable sorts of behavior. That doesn't make it right.
What you can ask is where you can find a variety of bushcraft knives to see which might impress you as Ray Mears' does. We would point out knives of excellent design and manufacturing quality, over a reasonable price range. Please DON'T call them clones. They are each maker's understanding of the bushcraft concept. They are not marketed as rip-offs, feeding off an original's reputation.