Asus PCE-N13 Wireless 802.11b/g/n PCI-Express Adapter for $19.99 shipped by joining MClub. MClub is basically a subscription to Mwave’s discount and emailing list. Here is a screenshot for your reference. It connects via wireless-N at up to 300Mbps and supports all the standard security protocols. Most places have it for about $27 or more.