Can't find a bell curve drawing template

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I am a math tutor inclusive of probability and statistics. For years, I have illustrated probability distribution concepts to my students using free-hand drawn (not very well) Normal and other distribution (e.g., Poisson, Chi-Squared) curves. Also for years, I have been in search of a tracing template made of plastic or some other solid material (not paper) to draw these curves, and have come up empty. Does anyone know where I might find one? Or, is there some reason these templates don't appear to exist in a solid form? I have seemingly located tracing templates for every other curve or two-dimensional object in existence. Thank you!