I went to a place here on the West Coast called Tap Plastics and had them make me two cases for show displays. Both came out beautiful. They were large to hold (2) 1/25 scale cars each.
My guess for an 1/8 scale case figure $100 - $120 for one.
I love Mecum Auctions and Barrett/Jackson auctions.
I bought all the model stuff I wanted for Christmas because no one else would spend that much on me