Newegg has LINKSYS WUSB54G USB 1.1/2.0 Wireless-G Adapter for $29.99 + free shipping.
Model
Brand LINKSYS
Model WUSB54G
Spec
Standards IEEE 802.11b/g
Wireless Data Rates Up to 54Mbps
Security WEP Encryption, WPA Security, CCX 2.0
WPA/WPA2 No
Interface USB 1.1/2.0
Frequency Band 2.4GHz
Channels 802.11b / 802.11g
11 Channels (US, Canada)
13 Channels (Europe)
14 Channels (Japan)
Modulation CCK, OFDM
Transmitted Power 16+/-1dBm (Typical)@11Mbps CCK,
14+/-1dBm (Typical)@54Mbps OFDM
Antenna 2dBi
System Requirements PC with 400MHz or Faster Processor:
128MB RAM Memory
CD-ROM Drive
Available USB Port
Windows 98SE, Me, 2000 or XP with
Service Pack 1 (or later)
Dimensions 3.6" x 2.8" x 0.9"
Weight 0.2lbs
Temperature 0°C - 40°C (32°F - 104°F)
Humidity 10% - 85%, Non-Condensing
Windows Vista Certified for Windows Vista
Feature
Features Compatible with 802.11g and 802.11b (2.4GHz) Standards
Supports USB 2.0 with up to 54Mbps, High-Speed Data Transfer Rate with Automatic Fallback
Plug-and-Play Operation Provides Easy Setup
Compatible with Microsoft Windows 98SE, Me, 2000, and XP
Packaging
Package Contents WUSB54G
Resource Disk
USB Cable
User Manual
LINKSYS WUSB54G USB 1.1/2.0 Wireless-G Adapter - $29.99 FS 
