As one of its daily deals, Best Buy offers the Sennheiser HD 558 Headphones in Titan for $74.99 with free shipping. That's the lowest price we could find by $25, although they were $5 less in March. These open circumaural headphones feature a 15Hz to 28kHz frequency response, gold-plated 1/4" jack, and internal sound reflector. Deal ends today.