This is knit in the round in one piece, so there is no seaming. Just a few ends to weave in.
You can check with your LYS for this yarn, or it is available at Jimmy Beans or WEBS online.
This pattern is available for purchase only through my Craftsy store. Click on the picture below to be taken to Craftsy. You must be a member of Craftsy to purchase this pattern. Sign up is free, so if you aren't a member, I encourage you to sign up.