In Skyrim I have a quest to retrieve a mammoth tusk to help someone set up as a merchant. Of course, mammoths are generally being shepherded by giants. I do want to [kill a giant](https://gaming.stackexchange.com/questions/34719/how-do-i-kill-a-giant) at some stage but my character isn't quite ready for that yet. Is there any way to obtain a mammoth tusk without taking on a giant?