http://www.harrietcarter.com/index.cfm/fuseaction/product.detail/categoryID/107E2F70-FF73-448B-9C7A-960FCA072E99/productID/DD5851FC-9157-458E-99A5-3EC5E69C79C9
Or contact member Scott/Quietontheset.
He makes extremely high quality mask display cases. His te seems to be down at the moment so try asking him