Amazon $ 17.99. Ships free with Prime: http://www.amazon.com/Optical-Qua…B008M1B3R8

Or

$ .99 more at Newegg for those without Prime

$ 18.98 shipped at Newegg with coupon 0322CHAME85 (ends 3/28) — $ 17.99 + $ .99 shipping:
http://www.newegg.com/Product/Pro…6817607055