SonicElectrronix.com via eBay offers the Klipsch Reference S4 Premium In-Ear Noise-Isolating Headphones, model no. 1013730, for $41.59 with free shipping. That's a few cents under our mention from three weeks ago and the lowest total price we could find now by $6, outside of the price below. Features include four different-sized ear tips, storage case, 10Hz to 19kHz frequency response, and more.

A close price: World Wide Stereo via eBay charges $41.75 with free shipping.