Amazon offers Prime members the Sennheiser CX 3.00 In-Ear Headphones in Black, Red, or White for $29.95 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, shipping costs $6.11.) That's the lowest total price we could find by $24. Features include a 17Hz to 21kHz frequency response, 18-ohm impedance, and a 3.9-foot cable.