etechdirect via eBay offers the refurbished Netgear 802.11n Wireless 4-Port Broadband Router, model no. WNR2000-100NAR, for $19.95 with free shipping. (Walmart and newegg both charge a few cents more.) That's the lowest total price we could find for a refurb by $5, although we saw one for $2 less in April. This router offers 128-bit WEP, 64-bit WEP, WPA-PSK, and WPA2-PSK encryption. Other features include parental controls, an internal antenna, and more.
Of note, no warranty information is provided.