Lenovo offers its Lenovo P180 Headset with Microphone in Black, model no. 57Y6747, for $19.99. Coupon code "USP1SP346747" cuts it to $6.99. With free shipping, that's tied with our August mention as the lowest total price we've seen. (It's a current low of $8.) It features an omni-directional microphone and carrying case.