Newegg offers the refurbished Logitech TK820 Wireless All-In-One Keyboard in Black, model no. 920-005108, for $39.99 with free shipping. That's tied with our August refurb mention and the lowest total price we've seen. (It's also the lowest total price we could find for a refurb today by $5.) It features a built-in touchpad.

A 90-day warranty applies, but it's unclear who backs it.