If you've got some grant money that needs spending and will be using benzene-D6 for a long time, CIL is selling a kilo for $1,800. kinda an unreal deal. If I was in the first year of my career, I would do this in a heartbeat. Would have saved me a fortune.
https://isotope.com/special-offers/product-category=nmr-solvents-and-consumables/benzene-d6-d-dlm-1-group