Polar Pure water treatment-Why the sudden price jump?

Has anyone noticed the price jump with Polar Pure Iodine crystals? The bottles used to be less than $20 and now I see they have suddenly jumped to $40 plus. Crazy. Maybe they are in short supply of Iodine? I don't think so. You can still buy it cheap on eBay. One ounce for $15. I wonder whats up?