James needed an answer before he really commited to a line. It was in his cautious nature but he also didn't want to be left out so he'd slip to the end of the Blue line until the guard answered Circe's question fully. Hopefully sale didn't mean FOR sale either or they might have a different set of problems on their hands.
"Do you know what they trade in sir? Any places of note we absolutely must see while we're here." If he was going to queue he might as well get something out of his time.