ec2-18-222-163-31.us-east-2.compute.amazonaws.com | ToothyWiki | RecentChanges | Login | Webcomic A shop which will appear overnight. Once it's appeared, it will always have been there. They generally show up for long enough for the hero to buy something critical to the plot, then vanish without a trace. Cambridge has stalls in MarketSquare which fulfill a similar role, only without the heroes.
And except that in the MarketSquare, they show up at times when you don't need the item; when it later becomes critical to your plot, the stall has vanished without a trace. --AlexChurchill
That explains everything. Clearly, MarketSquare is their holiday destination of choice; or maybe a traders' gathering, like the Bazaar in Robert Asprin's Myth books. -- MoonShadow