Try ebay and from seller pipe1976. He is handicapped and makes very nice protectors to stay active and for incredibly low prices. He custom made a 3 piece set for me from cocobola and gabon ebony with a silver ring in my specified diameter for $18 including shipping. I would post photos if I knew how but I would say they are $50 jps. His protectors are much better than his ebay photos so buy with confidence. He is Lonnie Wilber that is mentioned above.
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Preferably Black Ebony or Maple Burl...show me what you got!
Here is a link to photos of the joint protectors I just recieved from Lonnie.
Link:
http://s201.photobucket.com/albums/aa188/redstevens/Pool Stuff/
There are also photos of the wood case I made for my Perry Weston cue 20 years ago.
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