Here is a source for isinglass (and it's cheap, too)!
Mica composite, 1/32 - 1/6" thick. various sizes up to 3.25x4.5".
American Science & Surplus
3605 Howard Street
Skokie, IL 60076
Ph 847-982-0870
M-F 8am - 530 pm CST
Fax 800-934-0722
Rhea Tannenbaum
Exhibits Coordinator
Gumbo Limbo Nature Center
Boca Raton, FL
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RheaT