I completed the Dawnguard main quest and still have the three Elder Scrolls in my inventory. I can't drop them as they are still marked as quest items. I tried to sell them to the Orc (forgot his name) at the College of Winterhold, but I don't have the option to when speaking with him.

Is there any way to get rid of these things? That's 60 pounds of dead weight in my inventory that I'd like to get rid of.