mini basketball acrylic case?

I have a mini basketball that was given out an event and signed by Boston Celtics legend Jo Jo White. The ball is about 5 3/8" in diameter (at the very most 5.5"). Anyone know if there is an acrylic case that would be big enough to hold this, without being too big? It is bigger than a softball for sure. It is a Spalding ball with an NBA logo, so I would imagine it is a common promotional type item; but may not common enough for a supply company to make something in that size. I was thinking maybe a mini football helmet holder might be close to the right size?
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Comments
Crystal Caseworks has a few different types from which to choose. Many have interior dimensions of 7 3/4" x 5 1/4" x 5 3/4", which would probably be just about right.
You might want to Google "acrylic holders" for a few other sources.
Good luck!
PoppaJ