Emma has rather an adventure of a time haggling the man down without making it clear that they need mice, in particular, and somewhat urgently. But she's watched her father for years, gone with him on his business trips, helped him translate some of his deals. She's not good at standing up for herself, but with her friends backing her up she can just... imitate him, closely enough to cover the gaps.

The mice aren't cheap, but she gets a reasonable discount.

Handing over a quint-gold, she accepts her change and smiles at Holly. "Good? You have your mice?"