Are you a member of Ravelry.com? If not, it's free to sign up. If you are, there are several people that have Caron Perfect Match in Winter White listed in their stash. Click here
to see members with this yarn. None are officially listed as being for sale or trade, but if you're not able to find it anywhere else you could always try contacting a few of them to see if they'd be willing to part with a few skeins.