When in doubt, just Google! Amazon sells them. So does Bed Bath & Beyond. Here is their site.
They are usually sold by independent contractors who start their own home-based business, but I used their name plus com. This is the website showing their story. Click on your country and it will take you to a website where they sell them online. You might also be able to find someone in your area by contacting the company from their website https://norwex.biz/ Wishing you the best.
amazon has them
Hi Marsha: I don't know where to buy then, but here is a site that talks about them:
I agree with Amazon although they will be a little more expensive versus going through an independent contractor.