Happiness Market via Amazon offers the Tiergrade Wireless Magnet Attraction In-Ear Bluetooth Headphones for $29.99. Coupon code "9KZOVRDL" drops it to $17.99. With free shipping for Prime members, that's $2 under our February mention and the lowest price we've seen. (It's the best deal now by $6.) They feature HD voice technology, up to five hours of use on a single charge, and compatibility with iOS or Android devices.