Meritline offers the MEElectronics M9 Sound-Isolating Headphones in Black, model no. M9P-BK, for $17.99. Coupon code "MLCK7E28NL1" cuts it to $10.99. With free shipping, that's the lowest total price we could find by $7, although it was a buck less in March (since expired). These headphones feature an inline microphone, 20Hz to 20kHz frequency response, 3.5mm plug, and 4-foot cord.