Cafago offers the K2 Wireless Bluetooth Headphones in several colors (Black pictured) for $20.69. Coupon code "PT2694" cuts the price to $14.30. With free shipping, that's the lowest price we could find by $16. They feature Bluetooth 4.1, a wireless range of 33 feet, and a 450mAh power bank.

Note: This item ships from China and may take two to three weeks to arrive.