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   My default position on ammo is that you spend about 5 gp on ammo at character creation and then you forget about keeping track of it - by the time you blow through that many pieces of ammo, your character has enough treasure to make buying ammo something they do with their pocket change, not their treasure.

   When I actually have a player that cares enough to keep track, I prefer to run non-magical ammunition as a daily/encounter resource.

Daily -  You buy X amount of arrows, and that's how many you can use each day - Narratively, during an extended rest (and travel and other downtime, etc.) you replenish your supply through whatever means are situationally appropriate: looting enemy archers, foraging for materials and crafting your own ammo or reclaiming still-usable components from expended ammo and recycling them.

 Encounter -  During an encounter, you have access to one unit (however many comes in one quiver/case/bag) of your ammo. On the off chance you run out, it's a Minor Action to switch to a new one, assuming the rest of your ammo isn't stowed away in your backpack or other container. If you have the Quickdraw feat or any other method of free item-swapping, it's a Free Action.