It could be cool if you could find a Librarian for spell related stuff, like copying scrolls or to buy and sell scrolls,books ect to
Or a scribe: maybe you could take a blank spellbook to them and pay them to copy one of your existing ones into it. Then we'd have a use for those finally.
The class-specific shop for mages could get services like that. Still a general
Librarian/Scribe could be fun, deeper down.