You might also visit a serious model-making/hobby shop. The one near
me caters mostly to people who are into model trains, but they have
lots of interesting materials and the guys who work at the one close
to me are very knowledgable in using materials that are not typically
used in jewelry.
(Some of the guys at the model shop I go to are like the
record-collecting guys (and yes, it's all guys) in the movie High
Fidelity. It's always fun to go in there, especially when they're not
Christine in Littleton, Massachusetts, who wants you to know that
no one deserves lung cancer.