As you know, some knitting yarns and some shades of knitting yarn have a short life. When things are discontinued I am often able to get them at a lower price than normal and I pass the savings on here. Sometimes I am also able to get overstocks of current knitting yarns at a special price as the distributors need the space in their warehouses. Occasionally knitting yarn is produced in colors that are never marketed. This means that these shades are unique and will never be on sale to the general public. I have 2 shades of Rowan 4 ply Soft that have never been for sale in any stores.
Older pattern books can be found here too!
So be sure to look here frequently for bargain prices and knitting yarns that are only available in very limited quantity.