Best Buy offers the refurbished 2nd-generation Apple AirPort Express 802.11n Wireless Base Station, model no. MC414LL/A, for $39.99 with free shipping. That's $5 under our refurb mention from October and $20 under the lowest total price we could find for a refurbished unit now. This device uses 802.11n to play iTunes over your wireless network to your home stereo, acts as a wireless router, and enables wireless USB printer sharing.
A 90-day Geek Squad warranty applies.