A while back I purchased a Foxwoods dealer button and thought man I would love to use it but it's to nice and shiny to have scratches and people hands all over it. So to prevent all that I purchased some 50 mm air tight cases for them. For those that are unknowing, they are out there and you can purchase them cheaper at this website:
Cassidy Frames: Casino Chip Holders
The general store sells them at about $1 a piece but the shipping is about $8.
I purchased 3 air tight cases. With shipping and the promo code it came out to $4.70. They sell other unusual sizes. Each case came with a foam ring, so if you need more space you can take the ring out and fit up to a 60 mm chip or dealer button or whatever have you.
Take a gander: