Surplus Shed
Surplus Shed buys, sells, and trades government and other surplus and used optical and electronic items. Expect to find aerial cameras, telescopes, lenses, mirrors, prisms, boresights, borescopes, microscopes, electronic test equipment, beamsplitters, achromats, eyepieces, optical flats, mirror blanks, lens blanks, filters, and other optical and electronic stuff... and all available at a fraction of the original cost!
http://www.surplusshed.com/ - Details

Glowing Safety Paper/Sticker Paper
Glow in the Dark Safety Sticker is made from flexible vinyl, with glow pigment coating applied on. Glow Stickers come with a self-adhesive backing. Glow stickers can be easily cut into any shape or size and stuck on any surface. It is also possible to write, draw or print on these glowing stickers, creating instant signs that glow in the dark.
http://coolglowstuff.com/ - Details

Acrylic Sheets
#911 and #997 This style of Acrylic is like tinted window glass you can see objects through it. The color is all the way through the plastic, not just a coating on the top and bottom. This works great for sun catchers, etc... We stock it in 9 different 1/8" thick colors and the clear 1/4" thick.
http://www.sloanswoodshop.com/acrylic%20sheets.htm - Details