As one of its daily deals, Best Buy offers the Sennheiser HD 558 Headphones in Titan for $69.99 with free shipping. That's $10 under our mention from three weeks ago and the lowest total price we've seen. (It's the best deal today by $36.) These open circumaural headphones feature a 15Hz to 28kHz frequency response, gold-plated 1/4" jack, and internal sound reflector. Deal ends today.