Cowboom offers the used PlayStation 3 500GB Slim Console, model no. CECH-4001C, for $179.99. Coupon code "13369912" cuts it to $129.99. With free shipping, that's tied with our March mention and the lowest total price we've seen. (It's also $160 under the best price we could find for a new model today.) It features a built-in Blu-ray player, 3D support, built-in WiFi, and HDMI output.
Note: No warranty information is provided. Also, this used unit may have scratches or dents and/or be missing accessories, such as a controller.