I don't know of any contemporary manufacturers who make them. I've seen a few people recreate edge-list displays using a drill press and sheets of plastic. Ponoko might be a good option too for the fully DIY approach.
The only ones I've ever gotten are from eBay or private transactions.
That is essentially what I am looking for - a starting point to search ebay with. What I usually end up doing is searching through business/industrial>testequipment>meters category under used. . . And looking through 50 pages of auctions