3Dstereo via Amazon offers this Anaglyph 3D Red/Cyan Cardboard Glasses 3-Pack
in White for 20 cents
for shipping. At $0.55 per pair, that's the best per-unit price we've ever seen for 3D glasses, and the lowest total price we could find for this quantity by a buck. Sales tax is added where applicable. These 3D glasses are foldable.