If anyone knows someone who does good slipcase/traycase work and is willing to take orders for single copies, please share! I would ask about some of the casemakers for CD or Sub Press (and the traycase for the rebound Firestarter is a work of art) but I imagine they have some minimum order size? Maybe (hopefully) I'm wrong.
If folks are looking for super high end cases, I've seen some of the work of
H & H Book Services (link) in person at various rare book fairs and they are truly amazing. The custom leather illustrated traycases start at ~$1000...