Cambond via Amazon offers its Cambond Bluetooth 4.1 Sport In-Ear Headphones in Black, model no. EPS01, for $22.99. Coupon code "T7K6M9NS" cuts that to $18.99. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.99.) That's a buck under last month's mention, $51 off list, and the lowest total price we've seen. These waterproof and sweatproof headphones feature Bluetooth 4.1 with up to a 33-foot range, in-line controls and microphone, dual rechargeable lithium batteries with up to 10 hours of playback per charge, an adjustable tangle-free wire, flexible ear hooks, and three sizes of earbuds.