Looks like a very decent price especially considering it includes a monitor (valued at around $200).
Here are specs:
THINKCENTRE M700 SMALL FORM FACTOR DESKTOP
Processor Intel Core i7-6700 Processor (8M Cache, 3.4GHz), Turbo Boost 2.0 (4.0GHz)
Operating system Windows 7 Professional 64-bit preinstalled through downgrade rights in Windows 10 Pro 64-bit
Graphics -Intel HD Graphics 530 in processor, uses main memory, one VGA, one DisplayPort, supports two independent displays, works along with discrete graphics to support five independent displays; Max resolution: 3840x2160 (DP)@60Hz [HD 4x00]; 2560x1600 (DP)@60Hz [Intel HD]; 1920x1200 (VGA)@60Hz (Reduced Blanking)
Discrete graphics (optional) - None
Graphic Dongle (optional) - None
Memory - 8GB, DDR4-2133 PC4-17000, 2 DIMM , 32GB max
Storage -1TB 7200rpm, 3.5"
2nd Storage (optional) - None
Hard Drive Bracket - None
Optical drive - Slim DVD-Burner / CD±RW, SATA 1.5Gb/s
Chassis Dimensions (W x D x H) - 338 x 357 x 88 mm
Weight - Starting at 9kg
Floor stand - Vertical Stand
Power supply - 180W, autosensing, 85% PSU
Keyboard - Lenovo USB Edge Keyboard, black - English
Mouse - USB Optical Mouse, black
Audio support - HD Audio, Realtek® ALC662 codec
Speaker - Internal speaker for business audio (1.5 watt)
Wireless (optional) - None
Ethernet - Integrated Gigabit Ethernet, Wake on LAN
Fingerprint Reader - None
Chipset - Intel H110 Chipset
Security chip - Security chip
Physical security - Padlock Loop, Chassis Intrusion Switch (optional), Computrace Support, Security Lock Slot for optional cable lock
Manageability - Intel Standard Manageability
Front ports
-2 x USB 3.0
-Microphone (stereo, 3.5mm)
-Headphone (stereo, 3.5mm)
Rear ports
-2 x USB 3.0
-2 x USB 2.0
-Serial (9-pin)
-Ethernet (RJ45)
-Stereo audio ports (line-in, line-out, mic-in)
-VGA
-DisplayPort 1.2
-PS/2
Dust Shield - None
Bay - Internal bay: 1 x 3.5", 1 x 5.25", optional 1 x 2.5"
Expansion slots
-Slot 1: Low Profile, PCIe 3.0 x16 (45w max)
-Slot 2: Low Profile, PCIe 3.0 x1
-Slot 3: Low Profile, PCIe 3.0 x16 (x4 elec, 45w max)
-Slot 4: Low Profile, optional 32-bit PCI 2.3 (via M.2 to PCI adaptor)
Preload - Lenovo Solution Center, SHAREit, REACHit, Lenovo Companion, McAfee® LiveSafe™ (30-day trial), Microsoft Office (30-day trial)
Original 20% off at Selected Stores on eBay Deal Posts: CSITE20 & CSUNNY20
what kind of GPU can you throw into this considering it's only got a 180W power supply?