Beeebo-us via Amazon offers the Dodocool N300 802.11n USB WiFi Adapter for $13.98. Coupon code "T2DRPRT9" cuts that to $6.99. Plus, Prime members bag free shipping. That's the lowest price we could find by $5. It features WEP, WPA, WPA-PSK, and WPA2 encryption. Deal ends December 12.