Weifan via Amazon offers these Xiaowu Wireless Bluetooth In-Ear Headphones in Black/Red for $39.99. Coupon code "JI5VDC9E" drops it to $23.45. With free shipping, that's tied with last month's mention, $17 off, and the lowest price we could find. These noise-cancelling headphones are sweatproof and include three sizes of earcaps and a charging station. Deal ends June 30.