Gilwing,
If you are still in need, I recommend speaking with my daughter, Ama'Rali, at the coming gather. If I am not mistaken, the Order of the Wylde, which is under her charge, rents and sells arrows and bolts. I do not know whether you may fare better engaging the Brotherhood of Anvil and Iron, but I suspect it does not hurt one to "shop around", as they say.
-Vær'lux of Lordaq