For its newsletter subscribers only, newegg offers the ASUS 802.11n PCI Express Adapter, model no. PCE-N15, for $27.99. Coupon code "EMCNHJN46" cuts it to $19.99. With free shipping, that's the lowest total price we could find by $8. It features a max speed of 300Mbps, two dipole antennas, and support for WEP, WPA2, and WPA-PSK encryption. Deal ends February 29.