Apple MC414LL/A AirPort Express 802.11n Wireless-N Base Station for $78.99 shipped.  Here is a screenshot for your reference.  It features dual-band 802.11n Wi-Fi with simultaneous signal transfer at 2.4GHz and 5GHz frequencies, works with PC, Mac, iPhone, iPod touch, iPad, Apple TV and more.  Most places have it for about $99.