[Gallagher]

i also deal in straight runes and aurum, generally following the original release costs for items with a few exceptions. the general exchange is sending me a list of what you would like to purchase, then i check my inventory/credit and give you a quote for what i can sell at a given time.

which, generally, as long as you're not going for stocking up duplicates, i'll more likely than not be able to sell what you want.