Computers.Woot.com has Dell Optiplex 3040 Micro Desktop: i5-6500T, 8GB DDR3, 500GB Hard Drive (Refurbished) on sale for $269.99. Shipping is free for Prime Members, otherwise is $6.
Specs:Intel Core i5-6500T 2.5GHz (Turbo up to 3.1GHz)
6MB Cache Desktop Processor8GB DDR3 Memory500GB Hard Drive 7200RPMIntel HD Graphics 530External 65W Power Supply802.11ac Wi-Fi + BluetoothWindows 10 Professional 64-BitPorts:Front I/O Ports:2x USB 3.01x Headphone1x Microphone
Rear I/O Ports:1x DisplayPort1x HDMI2x USB 3.02x USB 2.01x RJ-45 LAN