Kem Medical Products markets a badge called Vapor-Trak
They are located in Farmingdale, New York.
Don't know the cost but you can call them at 1-800-553-0330

We use their badges routinely.

Vinnie
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Vinnie Della Speranza
Technical Director
Anatomic Pathology Laboratories
University Hospital & Medical Center
State University of New York at Stony Brook 11794-7025
(516) 444-8249
fax: (516) 444-3419
vdella@path.som.sunysb.edu