Amazon.com has the Microsoft MN-700 Wireless 802.11g Base Station Router for $46.44 (no rebates needed).
Intelligent software automatically detects your Internet service and modem settings for easy base station configuration
Commercial-grade, built-in hardware Stateful Packet Inspection (SPI) firewall and Network Address Translation (NAT) to help protect against unauthorized access
Full compatibility with 802.11g and 802.11b Wi-Fi networks
Flexible support for 256-bit Wi-Fi Protected Access (WPA) and 128-bit Wired Equivalent Privacy (WEP) delivers strong wireless security
Compatible with Windows 98, 98 SE, Me, 2000 Professional, and XP