Amazon offers the Sony PlayStation 4 500GB Gaming Console, model no. 10034PS, for $399 with free shipping. That's a buck under our mention from three weeks ago and the lowest price we've seen. (It's also the only store selling this still hard-to-find console without bundled accessories at higher prices.) It includes the system, a DUALSHOCK 4 wireless controller, wired headset, and cables.
Update: Walmart offers it for the same price. It's a buck more at Best Buy.