1byone via Amazon offers its 1byone Sweatproof Bluetooth 4.1 Stereo Earbuds in Black, Black/Green, or White/Grey for $38.99. Coupon code "74X98FSM" cuts them to $29.99. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.33.) These headphones feature a Panasonic battery core, inline microphone and controls, and active ear lock mechanism. Deal ends March 16.