They also have wares in dawnstar if you want to steal them from the invisible chest.

Non dawnstar invisible chest (for Eorlund Gray-Mane) This is a trick my cousin learned from a developer.
1. Enter whiterun
2. Go inside the left tower right inside
3. Step on the barrel
4. Jump out of the wall (might take a few tries)
5.Walk around the wall in the glitched up version of the outskirts of skyrim until you reach skyforge
6.You'll be able to walk through one of the rocks outside the wall
7. BAM chest full of Euorland Gray-Manes stuff and anything you sold to him , plus wolf armor and skyforged steel weapons if your in the companions