Nothing comes up on the Avon website concerning a humidifier, so most likely it has been discontinued. Couple of things you can try.
First try contacting Avon to see if they can provide any guidance.
https://www.avon.com/contact-us
Most likely you will not get any usable answers from their customer service, so,
Second, I would try locating an appliance repair shop in your area. It's possible that this unit was manufactured for Avon by a manufacturer still in business and the filters are still available under their name.
If not, it's still possible to buy filter material and "make" a filter that will work (after all, it's just foam, cut into a specific thickness, density, length and width). This is were a local appliance repairman could be valuable. They can be very creative. Good luck,
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