Demand:Arcane Spell Services (Pandlechron Supplement)
From D&D Wiki
 Arcane Spell Services Demand
A town may demand the use of a arcane spellcaster for various tasks. For each level spell demanded, this counts as a demand for the town (so Arcane Spell Services (6th) would could as 6 demands). 1/day in this town, an arcane spellcaster can sell a useful spell (such as Alarm or Locate Object but not Magic Missile) as a service at the regular asking price.