newegg offers the MEElectronics M9 Hi-Fi Sound-Isolating Headphones in Silver (pictured) for $9.99 with free shipping. (Amazon charges the same, although it's temporarily out of stock.) That's $2 under our September mention and the lowest total price we could find by $3. These headphones feature a 20Hz to 20kHz frequency response, 3.5mm plug, and 4-foot cord.

Of note, newegg also has them in Black for $11.99 with free shipping. (Amazon charges the same.) That's tied with our September mention and the lowest total price we could find by $1.