These look amazing! The feel is just right. I'm tempted to buy a pair!
These would be very good for reenactment, knowing you wouldn't wear out an original pair!
As for the price; you can follow this auction and see what it does:
In my view, prices for original like-new MkVIII's are around the 90 pound, often exceeding the 90 pounds. A new-boxed MkVIII for 60 pounds is in the past, IMHO. Certainly in the past on the net.
Normal goggles are 55 - 60 pounds so these replicas are not overly expensive, I don't think.