Belkin N1 Wireless Notebook Card F5D8011TT $20 at eCost

eCost has the Belkin N1 Wireless Notebook Card F5D8011TT for $25 - $15 rebate [Exp 7/8] + $10 shipping = $20 shipped. Network interface card is 802.11n (draft), 802.11g, and 802.11b compatible.

http://www.ecost.com/Detail.aspx?source=k16440