https://www.grainger.com/product/NASHUA-Duct-Tape-Nashua-15R451
This is what we get. I know Amazon has it cheaper but likely not 14/roll for that same size, I would guess it's probably about $20-30 if they have it.
Here are some more links to rolls the same dimension we buy to support the claim if needed. I couldn't find the same roll on Amazon except in a 12 pack for over $700 from the nashua store and a silver roll from a wholesaler but it's the same tape and it's exorbitantly expensive by any standard.
https://www.raptorsupplies.com/pd/nashua/357-aa7aga
https://www.amazon.com/Nashua-SI460-Premium-Grade-Duct/dp/B015T4QBZE