“That wouldn't cover production and shipping.”
Here cover means to pay for costs. The offered price would not meet production and shipping expenses. Six months wouldn't cover that cost. later uses the same meaning.
B1-37 / CEFR B1 / EPISODE 37
Negotiating a contract and a display request
SceneFrank is meeting Ms. Vance, a buyer for a store chain. They're discussing a regular order for his company's water-testing kits.

WORDS & CONTEXT
Here cover means to pay for costs. The offered price would not meet production and shipping expenses. Six months wouldn't cover that cost. later uses the same meaning.
A purchase commitment is a business promise to buy a specified quantity or over a specified period. In writing asks for a documented agreement, such as a contract, rather than a verbal promise.
In writing means documented in written form rather than merely promised verbally. It is an important expression in contracts and business transactions.