ProducTech via eBay offers the Treblab X2 Completely Wireless Bluetooth In-Ear Headphones in Black or White for $44.99 with free shipping. That's $5 under our March mention and the lowest price we've seen. (It's the best deal today by $15.) They feature a mic, Bluetooth 4.1, IPX4 water resistance, and 10 hours of playtime on a single charge.