Sonic Electronix offers the Sennheiser IE 80 Noise-Canceling Ear Canal Headphones for $279.99. Coupon code "IE80199" cuts them to $199. With free shipping, that's the lowest total price we could find by $84. (Most stores charge $450 or more.) These earbuds feature attenuation of up to 26dB, 10Hz to 20kHz frequency response, and adjustable bass tuning.