Best Buy offers the refurbished 2nd-generation Apple AirPort Express 802.11n Wireless Base Station, model no. MC414LL/A, for $49.99 with free shipping. That's $20 under our June mention of a new model and the lowest total price we could find for a refurb by $9. 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.