Walmart offers the Sony PlayStation 4 500GB Gaming Console, model no. 10034PS, for $399.99 with free shipping. (Amazon offers it for the same price.) Outside of bundles, that's the lowest total price we could find by $120. It includes the system, a DUALSHOCK 4 wireless controller, wired headset, and cables.
Update: It's now out of stock at Walmart; however, Amazon still offers it for $399.99 with free shipping.
Amazon offers the Sony 3D WiFi Blu-ray Disc Player, model no. BDP-S5100, for an in-cart price of $79.99. With free shipping, that's the lowest total price we could find by $8, although it was $3 less a month ago. It features 2D to 3D conversion, Sony Entertainment Network with Netflix, Hulu Plus, and Amazon Instant Video, web browser, and Sony TV SideView app for controlling this player from mobile devices.