Used Lenovo ThinkPad P50s in fair condition, please check pictures. P50s is same as T560 just added dedicated GPU.

Everything are tested working well.

Processor 6th Generation Intel Core i5 Processor i5-6300U 2.4 GHz up to 3.0 GHz 3MB cache
Graphics Intel HD Graphics 520 in processor and NVIDIA Quadro M500M, 2GB memory;
supports external digital monitor via HDMI or Mini DisplayPort;
supports three independent displays;
Max resolution: 3840x2160@60Hz (DisplayPort via Mini DisplayPort cable); 4096x2160@24Hz (HDMI)
Meomry 16GB DDR3L-1600 memory, maximum 32GB, dual-channel capable, two DDR3L SO-DIMM sockets.
Display 15.6" (396mm) FHD (1920x1080), anti-glare, LED backlight, IPS, 250 nits, 16:9 aspect ratio, 160° viewing angle, no white spot, no scratch.
Storage 1TB SSD SATA 6.0Gb/s, 2.5" wide, 7mm high, removable, upgradable, SSD status is good, please check pictures
Ethernet vPro model: Intel Ethernet Connection I219-LM (Jacksonville)
Bluetooth Bluetooth 4.1 wireless, integrated in Wi-Fi + Bluetooth combo adapter
WLAN 11ac, 11ac+BT, Intel Dual Band Wireless-AC 8260, 2x2, M.2 card
Dimensions WxDxH: 14.98" x 10.17" x 0.88"; 380.6mm x 258.2mm x 22.45mm
Weight 4.97 lb / 2.25 kg
Media reader 4-in-1 reader (MMC, SD, SDHC, SDXC)
Smart card reader
Ports Three USB 3.0 (one Always On), MiniDP, HDMI, Ethernet (RJ-45), Dock connector
Camera HD720p resolution, low light sensitive, fixed focus
Audio support HD Audio, Realtek ALC3245 codec / stereo speakers, 1W x 2 / dual array microphone, combo audio/microphone jack
Keyboard 6-row, spill-resistant, multimedia Fn keys, numeric keypad, LED backlight
UltraNav TrackPoint pointing device and buttonless Mylar surface touchpad, multi-touch
Fingerprint reader Swipe style fingerprint reader on the palm rest
Internal battery Integrated Li-Polymer 3-cell (44Wh)
External battery Li-Ion or Li-Polymer 6-cell (47Wh), please check picture for battery details
Lenovo OEM 65W AC adapter
Preload Windows 10 Pro 64