Ofashion1 via eBay offers this Mini Bluetooth 4.0 In-Ear Headset in four colors (Beige and Black both pictured) for $2.97 with free shipping. That's a buck below our mention from last week and the lowest total price we've seen. (Outside of other eBay sellers, it's the best deal now by $3.) It features a frequency response of 20Hz to 20kHz and is compatible with most Bluetooth-enabled devices.
Note: This item ships from mainland China and may take three to eight weeks to arrive.