Ending today, newegg offers the Sennheiser CX 200 Earbud Stereo Headphones, model no. 502544, for $19.99. This $5 mail-in rebate cuts it to $14.99. With free shipping, that's the lowest total price we could find by $5, although we saw it for $5 less four days ago (since expired). Features include a 3.5mm plug, noise isolation, and a frequency response of 20Hz to 20kHz.