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