Microsoft Store offers the Yurbuds Ironman Inspire Talk Sport Earbuds in Aqua or Black for $19.99. Coupon code "p4ubwfhv3" cuts them to $14.99. With free shipping, that's the lowest total price we could find by $10. They feature a 3-button in-line mic, sweat resistance, and compatibility with iPhone, Android, and Blackberry devices.