MiniInTheBox offers this 802.11n Wireless Range Extender for $9.49 with free shipping. That's $2 under the lowest price we could find for a similar one. It features transfer rates up to 300Mbps, an Ethernet port, and WPA2, WPA, and WEP security.

Note: This item ships from China and may take two to five weeks to arrive. Uncheck "Add Shipping Insurance to your order" during checkout to remove the 49-cent fee.