Adorama offers the Beyerdynamic DT-770 Pro Closed Headphones for $154.99. This $30 mail-in rebate drops it to $124.99. With free shipping, that's the lowest price we could find by $25, although we saw them for a buck less in May. These studio headphones feature 250-ohm impedance, a 5Hz to 35kHz frequency response, single sided cable, and gold-plated jack.
Also available are the Beyerdynamic DT-990 Pro Semi-Open Headphones for $154.99. The rebate above drops them to $124.99. With free shipping, that's $15 under our June mention and tied as the lowest total price we've seen. (It's a current low by $5.) Features include a 5Hz to 35kHz frequency response, 250 ohms impedance, 3.5mm gold-plated jack, and 1/4" adapter. Both deals ends August 17.