Best Buy offers the refurbished Apple Wireless Bluetooth Keyboard, model no. MC184LL/A, for $39.99 with free shipping. That's $6 under our June mention of a new one and the lowest total price we could find for a refurb by $8. Sales tax is added where applicable. This ultra-thin keyboard features an aluminum enclosure and Bluetooth connectivity. It requires two AA batteries (included).

Note that this item is sold "as-is" and no warranty applies, although Best Buy's return policy does apply.