monoprice.com has
this USB Wireless Lan 802.11G with Antenna
for $9.32 + about $2 for shipping
With this Wi-Fi 54g USB Adapter you can add wireless 802.11 b/g internet access to any computer with a USB port. Now you can easily upgrade your older laptop or add wireless internet freedom to a desktop computer. Designed to provide excellent performance while drawing as little power as possible, this Wi-Fi 54g USB Adapter is perfect for laptop users who want wireless internet freedom without running their battery dry. This Wi-Fi 54g USB Adapter features full compliance with the IEEE 802.11b/g wireless standard offering the best compatibility and future-proof reliability.
Featuring full WEP (Wired Equipment Privacy) and robust WPA (Wi-Fi Protected Access) security, the Monoprice Wi-Fi 54g USB Adapter lets can check e-mail, surf the internet and share files on your wireless internet connection with the highest level of protection.
*** This network adapter is only intended for use with computers that have a Windows or Mac operating system. This adapter can NOT be used for blu-ray players, televisions, gaming systems (Wii, PS2/PS3, Xbox), or any other device that does not have a Windows or Mac operating system.
Features
Add Wireless 802.11 b/g access to any USB enabled computer
Up to five times faster than previous generation wireless connection standard (Wireless 802.11b)
Full 64-bit or 128-bit WEP (Wired Equivalent Privacy) and WPA (Wi-Fi Protected Access) security for protected internet usage
Supports Microsoft Windows 98SE, Me, 2000 , XP , Vista / MAC OS X / Linux
Operating distance of up to 300 meters in open space
Easy operation and set-up
1Mbps, 2Mbps, 5.5Mbps, 11Mbps selectable Data Rate
Supports USB 1.0, 1.1, 2.0 connector ports
2.400GHz ~ 2.4835GHz unlicensed ISM Frequency Band
DSSS (Direct Sequence Spread Spectrum)
Modulation Method: DQPSK / DBPSK / CCK
Ralink USB Wireless Lan 802.11G with Antenna $9.32 
