He stops to talk as briefly as possible to the proprietor, and then heads north.
He observes a lack of "no soliciting" signs, and heads doorward to knock.
"I'm looking for a Mr. Terunone; I've been informed he buys things retrieved from magics?"
"Yes, of course." Making the assumption that the word "short" doesn't mean something drastically different here, but it seems like a fair one.
I just came out of a magic, and was apparently very lucky if that chair is anything to go by, and heard that you offer a fair amount even for useless items sometimes.
I've got a wallet full of what I assume is meant to be money that's no good here, and these clothes if it's worth making another trip back here after buying some normal ones, but the main thing is this."
He shows the pocket watch. "No explosions or unexpected behavior of any kind. But it keeps track of what time of day it is, more precisely than any non-magical method. And it can show you which way is north, if you need that kind of thing." He launches into an explanation of how to use it for both.
"Fifteen hundred? There isn't exactly a standard number, inconveniently enough."
"Probably not, but it's possible. Did you have something specific in mind?"
But considering how predictable magics aren't, it would require an astonishing amount of good fortune for such a thing to even exist."
"Afraid not; maybe if they worked in metal instead of yarn. I realize objects that do useful things predictably are rare; that's why I thought it more worthwhile to start from money rather than barter."
"Neither of those sounds like it would be useful in my enterprise, unfortunately."
"A thousand sounds close enough. I think we have a deal."
The banking system could look like anything here. Slavers might accept bank notes and make change, or they might not. For that matter, the notes could be backed by gold, or anything else, or nothing at all, and who knows what that might mean.