Was it Pellon's Quilter's Touch? Here it is online (along with others) at Walmart.com:
http://www.walmart.com/search/?query=batting
Usually you can either have an order sent to your nearest Walmart or (for a certain size order) have it delivered to your home. I have done it both ways (not with batting) and had it work out well.
Edit: Oops! I see the Pellon's is 90" wide and 9 yards.
Edit2: Further down is the Pellon 60" wide and 20 yards, but it's $50 at Walmart.