Monoprice offers its Monoprice Premium Hi-Fi DJ Style Over-the-Ear Pro Headphones in Black, model no. 8323, for $17.99 with free shipping. That's the lowest total price we could find by $12 and the best deal we've seen for a single pair. They feature a 20Hz to 20kHz frequency response, 3.5mm jack, two 3.5mm audio cables, and 3.5mm to 1/4" gold-plated adapter plug.
Monoprice offers its Monoprice Hi-Fi Reflective Headphones in White/Silver, Green/Silver, or Red/Blue for $9.99 with free shipping. That's $4 off and tied with last month's mention as the lowest total price we've seen. They feature a flat cable, 90-degree connector, and inline microphone.