MobileCityOnline via Amazon offers Prime members the RevJams Active Bluetooth Sport Earbuds in Black, model no. REV300-BLK, for $29.99 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it costs $6.27.) That's the lowest total price we cold find by $10. They feature Bluetooth 4.0, an inline remote and microphone, tangle-free cable, and up to six hours of playtime.