The Grand Market is a large bazaar just northeast of the Inner Circle in Madrioc. It contains a colorful variety of vendors, selling clothes, food, weapons, or just about anything you can think of. Due to the lack of organization and general chaos of the market, however, it may take some time to find exactly what you want, and there's no guarantee you won't get gouged on pricing.
Tyerjon bought a cage for his crickets here, and Wander haggled with a shady dealer, buying some acid and a disguise kit.