I was farming for the plans for the Nightmare staff of herding and got the normal staff of herding plans. Since I already got the normal staff I have no need for the plans. I can't sell it and I can't AH it.
Is there anything to do with it, or should I just drop it to not take up place?
Best Answer
Throw it away - as you've mentioned its bind on account and cannot be sold on the auction house.
The plans for the later difficulties are not farmed, they're purchased from a vendor in Act 4 so to get the recipe for the Nightmarish Staff you need to do the following:
It is worth noting that the chance that Gorell has the recipe is not 100% - if he doesn't have it in your game simply leave the game and re-create it until he does. You will need to do this for each difficulty, so nightmare for the nightmarish plans, hell for the hellish plans, etc.
Hope it helps