Google "Hexagonal Display Case".
I got lucky and found a jewelry store going out of business and had this for sale for $200, although I belive I got it for $175 cash. Knowing they are worth $500, I grabbed it quick. She had a double wide one, which I regret not getting.
I highly recommend them, you could do 3 tiers of 1/6 scale figures easily. I would definitely swap out the stock lights though, they got very hot (I tested them on for an hour with no figures first).
Here is the wider version, which I wish I bought:
https://www.storesupply.com/pc-12869-1162-black-stretched-hexagonal-display-tower-65235.aspx