Newegg offers the Trendnet 802.11n Wireless Easy-N-Upgrader, model no. TEW-637AP, for $29.99. Coupon code "EMCETEJ47" cuts it to $9.99. With free shipping, that's the lowest total price we could find by $20. This device connects to your current 802.11b or 802.11g router to give you 802.11n wireless capabilities. It features data transfer speeds of up to 300Mb/s. Deal ends April 11.