It probably went something like "we can do $5.00 per unit, sold in cases of 6"
"Ok, we'll order 6000 at that price"
"Ok, we'll order 6000 at that price"
I'd think the big company would almost demand that or else the coffee roaster could ship 6000 zip lock baggies with 10 coffee beans in each. I know that's an absurd example but a PO and contract protects everyone against that and that's why any reasonable company doesn't proceed without defined terms.
6,000 units @ $30 per unit
Or
36,000 units @ $5 per unit
You can't have:
6,000 units @ $5 per unit with the expectation that you're going to get 6,000 cases