If you have not gotten your $40 Gift Card for $20 from Google get it here: http:// 5776
This is the cheapest I see. It has really good review from Amazon too.
Link: http://www.newegg.com/Product/Product.aspx?Item=N82E16875984055
LG Behind-The-Neck Stereo Bluetooth Headset w/ Multipoint/ Music Streaming/
Call Waiting Support (HBS-700)
"Learn more about the LG ELECTRONICS HBS-700
Model
Brand
LG
Model
HBS-700
Spec
Type
Bluetooth Stereo Headset
Ear Coupling
Behind the Neck
Talk Time
Up to 10 hours
Standby Time
Up to 360 hours
Operating Range
33 Feet
Compatibility
Bluetooth 2.1"
Master Q