The Fire Brigade keeps most of the good stuff they pilfer from burning buildings - money, valuables, spellbooks. For things they don't want, owners or relatives of the deceased have the opportunity to buy their things back at the pawn shop across the way.
The most prevalent category of goods at the Unsigned Pawn Shop are wizards' familiars: bound 'til ransom given. The Fire Brigade ends up 'rescuing' a lot of them, and, unable to put them to good use for themselves, make 'em decent hostages.
Plenty of wizards either die or can't pay the Pawn Shop to have them released, and their familiars end up accumulating shelf space.
Roll 2d12 for the Shop's inventory. For each entry you have two options for purchase (so, a total of 4 options). Inventory updates every month.
Familiars typically cost 3d6 x 10 spellgold
Everything else typically costs 2d6 x 10 spellgold