Best Buy offers the refurbished Apple AirPort Express 802.11n Wifi Base Station, model no. MB321LL/A, for $39.99 with free shipping. That’s $10 under our September mention and the lowest total price we’ve seen since January, when it was $6 less. Sales tax is added where applicable. The AirPort Express uses 802.11n to play iTunes over your wireless network to your home stereo. It also acts as a wireless router and performs wireless USB printer sharing.