Buy.com offers the
Buffalo Technology AirStation N150 802.11n Wireless Router and Access Point, model no. WCR-GN, for $19.99 with free shipping
sells it for the same price via Prime.) That's tied with last week's mention and the lowest total price we could find now by $12. (It's also tied for the best no-rebate price we've ever seen.) It features four Ethernet ports and push-button setup.
Update: The price has increased at Buy.com; however, Amazon still offers it for $19.99 with free shipping for Prime members.