Halloween // Halloween masks display case suggestions?

I just picked up a couple of masks sized 18inches in length for a birthday present. I found a couple of adjustable stands that I will use to prop them up. Unless anyone has any good suggestions or recommendations.

I am wanting to get a couple of cases to display them in. If it matters, these masks are autographed. So I do appreciate budget friendly, but I want to make sure that the masks will be well preserved in the cases as the same time. Of course budget friendly may be the better option being that the masks cost me a small fortune already. :P Really hoping for some great suggestions. Thanks! :)