[Suggestion] Cannonballs in shop?

Alright, I cannot be the first iron man who have thought to them selves, god smelting Cannonballs surely is boring.

So I thought to my self, why wouldn't there be a NPC shop that sold these Cannonballs, at a higher rate, than the usual pricing, that are used in Grand Exchange?

I example, 300 gp for each Cannonball, the current going rate is 198 gp, and having Cannonballs at these rates would surely not harm anyone who is not an iron man. Iron men would have the ability to choose this alternative to smelting them your self.

This may cause some chatter, concering the ''unfair-ness'' of this NPC shop, however I would like to refer to the Charter shops, which are currently selling various crafting supplies, and this shop would surely bring alot of ''Quality of Life'' to some iron men out there.

I hope others will support this suggestion, and it could even be apart of Zeah as well, maybe apart of the Lovakengj, with a requirement of 50% favour?

If you have suggestions that would help this idea, please submit them, so we can bring this up to Jagex.