The “2005 Stock Parts List” from Meller Optics Inc. describes optics that can be purchased online, including more than 1000 sapphire types in various configurations and more than 1500 others made from silicon, germanium, barium fluoride, calcium fluoride, laser glasses, and fused- and crystalline quartz. The overrun list provides specifications, prices, and information on available quantities. The optics typically have dimension tolerances from ±0.001 to ±0.005 in.,10 waves to l/10 flatness and 10-5 to 80-50 scratch-dig surface finishes.