wuxiuli2010 via eBay offers this Wireless Bluetooth Sport Stereo Headset in four colors for $11.98 with free shipping. That's tied with last week's mention and a buck under the lowest total price we could find for a similar Bluetooth headset now, outside of the mention below. It features a frequency response of 20Hz to 20kHz, up to 10 hours use time, neck strap, and noise reduction.
Expect delivery to take two to four weeks.
A close price: Ninja31415 via eBay charges $12.39 with free shipping.