Amazon Warehouse Deals offers its Prime members offers the used TP-Link 300Mbps 802.11n Universal Wireless Range Extender, model no. TL-WA850RE, for $10.28 with free shipping. (Non-members can spend $35 or more to bag free shipping; otherwise it adds $8.35.) That's $20 under the lowest total price we could find for a new unit and the best price we've seen for this item in any condition. It extends the range of wireless signals and features Ethernet, 64/128/152-bit WEP, WPA-PSK / WPA2-PSK encryptions, and five indicator lights.

No warranty information is included.