I just wanted to share this. Today I was at the Subaru dealership in golden and the parts guys informed me that they now sell extra-s by the quart. He said the price is around $10 per quart. I wish I would have known this last week before I spent $83.00 for 5 quarts from Fred Beans.
Here's the link for that dealership - http://www.gosubaru.net/index.htm