Muzo Tech via Amazon offers Prime members the Meidong Wireless Bluetooth Noise-Canceling Headphones in Black for $45.88. Coupon code "IP26V8GX" drops that to $29.99. With free shipping, that's $3 under our March mention and the lowest price we've seen. (It's the best deal now by $28.) They feature a frequency response of 22Hz to 22,000kHz and up to eight hours of playback.