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Hi, Matt
I work for Foldscope Instruments (full disclosure) and suggest considering Foldscopes for an activity. The Foldscope is a low-cost microscope made of paper and a small glass bead for a lens. It costs less than a dollar to manufacture and we sell them in packages of 20 for $25 (that's just $1.75 per microscope) They have 140x magnification and 2micron resolution, so very much like a microscope you would find in a science lab. And because they are so inexpensive, every student (or teacher) can have their own! See our website for more info.
For getting started, we have lessons online at Ted Ed that could be used including how to fold the Foldscope, how to view, how to make paper slides and how to make glass slides.
Once students have working Foldscopes, then we have subject lesson plans on our site that you can use with the Foldscope.
Good luck!
Christine
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