TomTop offers this 802.11n Wireless Range Extender for $9.99 with free shipping. (Be sure to choose the US plug option.) That's the lowest price we could find by a buck, although we saw a similar unit for pennies less in June. It features transfer rates up to 300Mbps, an Ethernet port, and WPA2, WPA, and WEP security.

Note: The countdown timer on the product page does not reflect an actual expiration time and resets daily. Also, this item ships from China and may take two to six weeks to arrive.