You can fashion your own acrylic display case with clear sheet you can purchase at any home improvement store. Get the thickest available, usually around 1/4", and hand cut it into box sides that you can cement together. IPS WeldOn #4 works about the best for acrylic, this is available in pints from McMaster Carr. Make sure the glueing edges are true and flat, then cement them as you would any styrene model! The exposed edges can be sanded progressively to 1000 grit, then they polish up beautifully with a felt Dremel wheel and compound. I usually use a base of plywood edged with an attractive molding that the clear dust cover can nestle into, just fashion the base after the clear case is finished as it is easier to trim the wood to fit than to modify the acrylic box. Have fun!