Amazon with Electronics Expo has the Sony MDR-EX58V/WHT In-Ear EX Headphones with Volume Control (White) for $15 + $3 shipping =
$18 shipped. B&H Photo Video has them in
Blue for
$18 with free shipping. Features 9mm 400 kJ/m³ Neodymium dome type driver (CCAW), 5Hz-23KHz frequency response, and 100 dB/mW sensitivity.