As one of its daily deals, Best Buy offers the Sony X-Series Over-the-Ear Headphones in Red/Black, model no. MDRX05/RB, for $39.99 with free shipping. That's $10 under our mention from two days ago and the lowest total price we've seen. (It's a current price low by $40.) They feature a 4Hz to 24kHz frequency response, 40mm drivers, and in-line microphone and remote. Deal ends today.

Update: It's now available for in-store pickup only.