Inexpensive lenses for kid's optics workshop

We are setting up an optics workshop for several hundred elementary
grade school kids at a science fair/science math exhibition that will
be attended by about 7,000 people. The kids will build simple
telescopes using two lenses and a PVC pipe. The kids will keep the
telescopes they build for free. Our budget allows the total price for
the telescope to be only about $7.00, so we are looking for a source of
inexpensive lenses. Plastic lenses for toys would work, but inexpensive
achromat objectives from surplus items such as binoculars would be
really great.

If anyone has any suggestions for a vendor, or suggestions about where
we can look for inexpensive lenses, please contact me. If a company
wants to donate lenses for this project, we will certainly acknowledge
the source of the donation.

Thanks! Kevin

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