LENS/OPTICS KIT

The OSA optics kit is now sold by Edmund Scientific:

  Optics Discovery Kit, OSA Optical Soc. Am.


FOR INEXPENSIVE LENSES, TRY:

   AMERICAN SCIENCE AND SURPLUS   (request their mail-order catalog!)
   http://www.sciplus.com

They sell:
  http://www.sciplus.com/category.cfm/subsection/21/category/188
  http://www.sciplus.com/category.cfm/subsection/category.cfm/subsection/21


ALSO TRY:

  SURPLUS SHED OPTICS

  EDMUND SCIENTIFIC