D-Link DWL-G510 Wireless PCI Adapter 802.11G 54Mbps $19.99

D-Link wireless products are based on industry standards to provide easy-to-use and compatible high-speed wireless connectivity within your home, business or public access wireless networks. D-Link wireless products will allow you access to the data you want, when and where you want it. You will be able to enjoy the freedom that wireless networking brings.

Buy.com is carrying this Wireless PCI Adapter for $19.99