The easy one first:
I think you would be able to buy the most Old Dust in the least amount of time if you price it at 6c. It vends to the NPCs at 4c so a lot of people sell at 6c. But it kind of depends on the people selling around you. Obviously, no one is going to sell to you if the guy next to you is buying for 15c.
The last time I sold Elrues, I priced them at 65c. But that was a while ago and I dun think I would price them that low again because it seems like people have been able to sell them for higher. I would price them high (say 120c) and see if anybody buys and just go down from there.
That would take a while but... meh, if you've got the time. Otherwise, price it lower if you want to sell them fast.
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