Just wondering if anyone has found a cave with a lot of Frostbite spiders in it they seem to be the best way to get petty soul gems atm i have found Crovangr Cave are there any others?
Volskygge has a tunnel with a good number of frostbite spiders in it. However, it is also on a one-way road to a nasty draugr boss. If you feel up to taking him on, you get an excellent item out of it, Volsung's Mask. But save your game when you get to the puzzle room because solving the puzzle commits you to going forward. That way if the draugr at the end is too difficult you can just leave and find some spiders that are less hassle.
I recently finished the totems mission for the companions and one of the locations was full of spiders.