I would say instead of a supplier for the equipment just have it appear on them when they join the guild. That way in case the guard is dead or there is a player GM that isn't overly active or helpful they can still get the gear right away. So what if it doesn't make total sense that gear appears on you....Call it an act of gods if it makes you sleep better at night ;\)
Ad astra per aspera. - To the stars through rough places.