[He takes a seat where convenient to watch it all play out. She doesn't do badly. He can't call her out on that. But at the same time, he's pretty sure Chopper could've managed a lower price than that. So when she returns, he'll try to be the good teacher and aim for positive reinforcement.]

Good. You did good. Although you gave in too soon. If you'd started to walk away, you would've got an easy ten percent more knocked off the price. Besides, he's a parts dealer. Chances are, you got the normal price.