GrandElectronics via Amazon offers the Ausdom M04 Bluetooth Over-Ear Headphones in Black, model no. M04S-B, or Black/Red, model no. M04S-R, for $54.99. Coupon code "EK3MMFN3" cuts that to $31.74. With free shipping, that's a buck under our mention from May and the lowest total price we've seen. (It's also the best deal we could find by $10.) These closed-back headphones can be used wired or wirelessly, and feature a 20Hz to 20kHz frequency response, rotatable ear cups, microphone, rechargeable battery, and USB charging cable.