It looks like North Carolina’s previous Weights & Measures law was entirely criminal. So in 1991 they added civil powers, but curtailed the fines.

The solution here appears to be less in raising the civil fine and more in criminally investigating, to start with, the store manager [1].

[1] https://www.ncleg.gov/enactedlegislation/statutes/html/bycha... § 81A-30.1