The standard, un-enhanced arrows that can be made are better than store-bought anyway. Copper & wooden flight arrows have similar stats from what I've seen (A-grade, not 100%) : 8 damage and +15 max range vs 6 damage and 5min/10max range on the store-bought flight arrows.
Which isn't to say I don't want to see what the enhanced ones are like!
But I've not found those mats yet either.