GeekDeal via eBay offers the factory-refurbished HP Pavilion 23-H024 TouchSmart All-in-One Desktop PC, model no. F3D46AAR#ABA, for $509.99 with free shipping. That's the lowest total price we could find by $14, outside the price below. It features an AMD A6-5200 2GHz quad-core processor, 23" 1920x1080 (1080p) IPS touchscreen LCD, 8GB RAM, 1TB 7200 rpm hard drive, DVD burner, WiFi, Bluetooth, and Windows 8.1 64-bit. A 90-day HP warranty applies. Deal ends October 1.

A close price: PCRush offers it for $514.12 with free shipping.