Proker via Amazon offers its Proker Wireless Bluetooth Headphones for $39.99. Coupon code "9ZOKP65X" drops it to $28.79. With free shipping, that's the lowest price we could find by about $18, although we saw them for $2 less last month. They feature Bluetooth 4.2, up to 2.5 hours of playback, and compatibility with iOS or Android devices. Deal ends February 28.