I buy the door crashers and grab bags of Aurifil at Tristan's. It's the only place I buy it. Even with shipping it's cheaper then anywhere else I've seen.
http://www.tristan.bc.ca/cart/home.php?cat=36 Genziana cotton is exactly like Aurifil but cost a little more. I love the Tre Stelle bobbin thread on the large cone:
http://www.tristan.bc.ca/cart/produc...&cat=31&page=1 it's all Italian made thread.