Wireless Router - linksys WRT54G - $20

WRT54Gv5

Going for $75 on Amazon:
http://www.amazon.com/Cisco-WRT54G-Cisco-Linksys-Wireless-G-Router/dp/B00007KDVI

All-in-one Internet-sharing router, 4-port switch, and Wireless-G (802.11g) access point
Wireless data rates up to 54 Mbps--5 times faster than 802.11b
Shares a single Internet connection and other resources with Ethernet wired and Wireless-G clients
Interoperates with 802.11b clients at 11 Mbps
Advanced wireless security with 128-bit WEP encryption, MAC, or IP address filtering
Wireless data rates up to 54 Mbps - 5 times faster than 802.11b