Beach Camera via eBay offers the Able Planet Behind-the-Neck Sport Bluetooth Headphones, model no. BT400B, for $24.99 with free shipping. That's $10 under our mention from last month, a current low by $55, and the lowest total price we've seen. They feature an on-ear volume control and microphone, folding headband, 30mm drivers, and battery life of up to 15 hours.