He corks the bottle he's got, and slips it into his cloak he'd picked up when she goes to reach for the blood red potion. There's no argument- they won't pay for it. He's just going to take it, he doesn't figure anyone will miss it given the label has been scratched off.

"I'd say grab as much healing ones as you can get," as he scans over a few bottles labeled 'mana', "because we don't know how powerful some of those demons really are. I don't want to base everything off of what we've been told."