Newegg offers the Klipsch R6 In-Ear Headphones in White, model no. 1060399, for $39.99 with free shipping. That's $9 under our January mention and the lowest total price we've seen. (It's also a current low by $12, although most retailers charge $77 or more.) They feature a 10Hz to 19KHz frequency response, 110dB sensitivity, and 6.5mm drivers.