Managed to get an old HP Z400 workstation for the equivalent of $75 USD. Xeon W3520, 6x2gb of ram and I replaced the Quadro FX580 with a GT 730 I had laying
Amazon.com: HP Z400 Workstation: Intel Xeon W3520 Quad-Core Processor, 2.67GHz/8GB RAM/500GB SATA/Dual NIC Cards/Windows 7 Professional : Electronics
Pack HP Workstation Z400 Xeon W3520 8GB RAM 180GB SSD NVS 295 + Disco – Digiplanet
HP Z400 Xeon Workstation With Improved Graphics - ONE TECH COMPUTERS
HP Z400 Workstation Intel XEON W3520 2.6GHz 4GB RAM K600 No Hard Drive | eBay
HP Z400 Workstation - 1 x Intel Xeon W3550 Quad-core (4 Core) 3.06 GHz - 3 GB DDR3 SDRAM - 500 GB HDD - 21.5" 1920 x 1080 Display 64-bit - Convertible Mini-tower - Jack Black, Alloy Metallic