You can now grab the NVIDIA T1000 graphics card aimed at workstation professionals for less than $400 in the U.S. The T1000 specs include four DisplayPort 1.4 outputs and support for up to five 5K or two 8K@60Hz monitors, a very slim design with one active fansink, as well as low 50W power consumption.
https://www.notebookcheck.net/Budget-NVIDIA-T1000-graphics-card-for-workstations-released-with-up-to-8GB-GDDR6-memory-five-4K-monitors-support-and-compact-design.598821.0.html