There's quite a lot of spells (and thus, potential demand for means to cast 'em more often) that'd be useful for rulers and governments in general, from relatively low-level stuff like Mold Earth, Alarm and Arcane Lock to higher-level Wall of Stone, Plant Growth, Control Weather and Teleport. Like, if we assume that the arts of enchanting wands aren't lost, and that it's possible for somebody to make a new Wand of Fireballs... somebody interested in economic development and sufficiently prosperous to invest a fair chunk of change might want to commission a Wand of Plant Growth and hire a druid to use it for better harvests. Dual-use items (adventuring and non-) might be rarer, but for instance there's probably a variety of protective items (e.g. for aristocrats worried about being assassinated or scried upon, for law enforcement that may occasionally need access to Knock or Find Traps for their investigations, Detect Magic and Dispel Magic if they have to deal with miscreants that employ magical defenses, etc). Anything that provides Truesight, likewise would have a lot of value to the security-minded if available.
Even commoners would probably appreciate ways to access Mage Hand, Mending and Prestidigitation for utility tasks. If permanent magic items that allowed casting these were available for reasonable prices that a prosperous business owner could afford, they'd definitely find buyers.
Magical weapons probably have fewer non-adventuring buyers, particularly highly specialized ones (e.g. arrows of slaying, unless we're talking about a city that's a major redoubt frequently assailed by the threat in question -- like, OK, if the City of Whatever is near a werewolf-infested forest, there's probably an unusual demand for all sorts of silvered and magical munitions; and similar for undead counters if the land is accursed and the dead regularly rise and attempt to slay the living).
Magic items that allow offensive magic, in particular either very destructive spells or mind control spells, might be highly restricted by jurisdictions worried about potential abuse. It'd be perfectly reasonable for a city government to be concerned about trafficking in Wands of Fireballs or, say, a Spell Scroll (Geas). A Sphere of Annihilation in an urban environment would be cause for extremely serious concern. A Scroll of Tarrasque Summoning or a Spell Scroll (Earthquake) is a WMD, and any private trade in such would probably have to be (metaphorically) deep underground.