Here are two more places to get prisms. Sargent-Welch has a 25mm x 25mm for $7.50 plus shipping. Science Kit also has an equilateral triangle with a base for display for $9.50 plus shipping. The shipping cost is $8.00 in both cases. If you order more than one the shipping costs can be shared.
January 30, 2007 at 4:27 pm
American Science & Surplus have prisms, too… plus lots of other funky stuff.
Shipping for a single prism is $5.95. But can you resist the pull of other tools???
http://www.sciplus.com/singleItem.cfm?terms=6179&cartLogFrom=Search