Ran across a good deal on Racequip FIA spec 6 point harnesses at Summit Racing. $150, which is about $100 cheaper than the next cheapest options. They are a closeout item and have last year's dates on them, so are good for 4 years instead of 5. I just got mine, and they look good to me.
https://www.summitracing.com/parts/VMS-854014