Best Buy offers the refurbished 2nd-generation Apple AirPort Express 802.11n Wireless Base Station, model no. MC414LL/A, for $59.99 with free shipping. That's tied with last week's mention as the lowest total price we've seen for this model. (It's also $27 under the best price we could find for a new unit.) 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 warranty applies, but it's not clear who backs it.