Amazon offers the Logitech Ultimate Ears 600 Noise-Isolating Headphones in Dark Silver, model no. 985-000118, for $49.99 with free shipping. That's $4 under our February mention of a refurbished set (these are new) and the lowest total price we could find now by $30. The built-in controls are compatible with iPhone, iPod, and BlackBerry. They feature a frequency response of 20Hz to 20kHz, five sizes of ear cushions, protective case, and more.
Expect this item to ship in one to three weeks.
Update: Specs have been corrected.