DBRoth via Amazon offers the Alfa High Gain 802.11n WiFi Network Adapter, model no. AWUS036NH, for $39.99. Coupon code "LI93VS7P" drops it to $24.99. With free shipping, that's the lowest total price we could find by $7. This 2.4GHz adapter features a clip window mount and interchangeable 5dBi and 7dBi antennas.