BuyDig via eBay offers the Beyerdynamic T1 Tesla Over-Ear Headphones, model no. 713805, for $739.99 with free shipping. That's $59 under our March mention and the lowest total price we've seen. (It's a current price low by $20.) Features include velour earpads, a leather headband pad, 5Hz to 50kHz frequency response, 600 ohms impedance, and 6.35mm gold-plated jack. Deal ends May 17 at 10:59 am ET.