Amazon offers the Sony Extra Bass Wireless Bluetooth Headset, model no. MDRXB950BT/B, for $98 with free shipping. That's the lowest total price we could find by $100, outside of the prices below. Features include Bluetooth streaming, built-in microphone, and up to 20 hours of use time per charge.
A close price: Best Buy and B&H Photo Video offer it for $99.99 with free shipping.