I use aurifil thread too and I mainly purchase cream color, light and dark grey. I do have a spool of black for when I want to do blanket stitching on something. Our LQS sells it for $13.00 each spool approximately but they do have sales once in a while and that is when I buy several. Their sale is usually "buy 3 and get 1 free". I really don't know where the best prices are but I am sure someone on this board will help you out.