Newegg offers the manufacturer-refurbished Logitech TK820 Wireless All-In-One Keyboard in Black, model no. 920-005108, for $34.99 with free shipping. That's $5 under our refurb mention from two weeks ago 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.
Of note, no warranty information is provided.