Meritline offers the Edimax 802.11n Wireless PCI-Express Adapter, model no. EW-7128Gn, for $19.99. Coupon code "MLC62E8NL1" cuts it to $14.98. With free shipping, that's the lowest total price we could find by $5. This features an external detachable dipole antenna with a 10-foot cable. Coupon expires after 200 uses.