So, in my current game, every time I buy dwarven arrows, Calcelmo sends a messenger after me insisting that I bring him one dwarven arrow.

He'll offer me a staggering 8 gold for it, which I can persuade him to raise to 10. Just received my fourth note from him. Needless to say, I'm eager to rush over to him and make my fortune of 10 gold, yet again.

Perhaps whatever script selects which dwarven artifact Calcelmo wants, should exclude arrows. Just a suggestion.

He wanted my single Dwarven Arrow too. Silly Calcemo, you have the right materials to make one yourself.

Or have the smith in the keep make it. I'm sure he'd love to sell a single arrow for 10 gold.

I bought something for 2430 coin and he wanted it. offered to pay me 100 coin for it... and no compensation for having traveled from one side of Skyrim to the other.

Now I just toss out the letters without reading them so no misc quest update.

I just never buy Dwarven arrows anymore. I don't loot them, either, not that that triggers it, at least I don't think so. But just in case, I avoid Dwarven arrows like the plague. I've done the quest once, and that's enough.

I think if you have one of his letters and never respond to his request it should stop him from bothering you further. In any case his letter is the reason I traveled to Markarth for the first time, and I quite like to have some incentive to do so.