World Wide Stereo continues to offer the Klipsch Reference S4 Premium In-Ear Noise-Isolating Headphones, model no. 1013730, for $54.99. Coupon code "15985K" cuts it to $41.99. With free shipping, that's $3 under our November mention and the lowest total price we could find by $7. Features include four different-sized ear tips, storage case, clothing clip, 10Hz to 19kHz frequency response, and more.