These kits are made by Accessories Unlimited and can be found at local yarn stores like mine! Here’s a link to their selection. They still use old-school Candide yarn and tried-and-true patterns. You can’t order directly from them, but I’m sure they’ll let you know the closest LYS that carries them.
These make up wonderfully! Be sure to check your gauge or you’ll risk running out of yarn.
On this one, I did change the colors in the foot of the sock. This is the third stocking I have made for this family and they wanted the foot to match the other two. I did have enough yarn to do this instead of the original.