Nokia BH-216 Bluetooth Headset (Gray) for free after this $15 rebate.  Here is a screenshot for your reference.  Shipping is free on orders over $25.  If needed, use this Filler Tool to pad the order for free shipping.  This headset has up to 6 hours of talk time and 160 hours of standby time per charge and a 33-ft operating range.  Most places have it for about $9 after the same $15 rebate.