Newegg offers the Rosewill 802.11n Wireless N600 Dual Band PCI Express Adapter, model no. RNX-N600PCE_v2.0, for $26.99. Coupon code "EMCEKEL37" cuts it to $16.99. With free shipping, that's the lowest total price we could find by $8. It supports speeds up to 300 + 300 Mbps. Deal ends June 13.