I've looked at all the stock at Dabs, Novatech, Overclockers, KustomPCs and Ebuyer. I've emailed or sent web-notes to all of them but am still waiting for replies. Googling brings up too many entries that include descriptions of full PCs rather than just DVDs and I've had difficulty refining them. No luck on ebay yet.
The trouble is most are advertised with just a black/silver/beige/all 3 bezel without specifying the material. I'm assuming that they're plastic.