Amazon offers Prime members the Panasonic ErgoFit In-Ear Headphones in Silver, model no. RP-HJE120-S, for $5.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.01.) That's a buck under our June mention and tied with the best price we've seen. (It's also the best deal now by a buck.) They feature a frequency range of 20Hz to 20kHz and include three sizes of earpads.