B&H Photo-Video offers the Sennheiser MM 30i In-Ear Stereo Headset, model no. 504739, for $34.95 with free shipping. (Amazon charges the same.) That's the lowest total price we could find by $10. This in-ear headset features a 17Hz to 20kHz frequency response, music and volume controls, a microphone, and three different pairs of eartips.