Egrow via eBay offers the Ausdom M04 Bluetooth Over-Ear Headphones in Black, model no. M04, for $30.99 with free shipping. That's a buck under our mention from a month ago and the lowest total price we've seen. (It's also the best deal we could find today 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.