DigJungle via Rakuten Shopping offers the refurbished Microsoft Xbox 360 E 4GB Console, model no. L9V-00001, for $89.99 with free shipping. That's $90 below our April mention of a new model (which was bundled with $40 in Microsoft credit, $20 in Newegg credit, and 800 Microsoft Live Points) and the best price we've seen in any condition. (It's a current low by $89 for a new model.) It features 4GB internal memory, WiFi, and a wireless controller.
A 1-year warranty applies, but it's unclear who backs it.