Logitech offers the Logitech MK550 Cordless Desktop Wave Keyboard / Mouse Combo in Black, model no. 920-002555, for $79.99. Coupon code "logi_mk550_62711" cuts it to $39.99. With free shipping, that's the lowest total price we could find by $20, although we did see it for $3 less two weeks ago (pictured). This ergonomic keyboard comes with a Logitech cordless laser mouse.

Of note, this is a dented box item; while the packaging may be dented or scratched, the product itself is new with a full Logitech warranty.