ZyXEL AG-225H 802.11a/b/g WiFi Finder, USB 2.0 Adapter, and Soft Access Point $39.99

The ZyXEL AG-225H is the ultimate tool for todays road warrior. It combines a 802.11a/b/g USB 2.0 adapter with a fully functional stand-alone hotspot detector in a sleek device small enough to fit in your pocket.
Hotspot Finder

The ZyXEL AG-225H makes it easy to find a wireless hotspot when you are on the road. The dual-band tri-mode USB adapter is equipped with a high contrast LCD screen and built-in LiON battery, which allows you to scan the environment for hotspots without being attached to your notebook computer. From the graphic LCD display, users can scroll through hotspots to view information such as SSID, encryption requirements, signal strength, band used, and channels used.

Buy.com is carrying this 802.11a/b/g WiFi Finder, USB 2.0 Adapter, and Soft Access Point for $39.99