BuyDig offers the Audio-Technica Solid Bass In-Ear Headphones, model no. ATH-CKS55USBK, for $44.95. Coupon code "EMSV" drops it to $34.95. With free shipping, that's the lowest total price we could find by $15. They feature a frequency response of 5Hz to 24,000Hz, dual chamber mechanism, and 12.5mm direct diaphragm drivers.