You can find it directly East of Yew gate.

Yea it's pretty empty, but it will be the best place for cheap prices (basically w/e I feel like at the time GM suit of armor up now for 700g).
Also, re-introducing RANDOM ADVENTURE RUNES
These are runes I find in my daily travels, and sell for 250g. The names have not been altered, nor are they promised accurate. Bored? Buy a rune, recall, and have a random adventure through Brittannia!