New filter for humidifier?

I bought the sunbeam aplomb mist humidifier for my son and need a replacement filter for it but can't seem to find one. I went out today looking for one and everyones decent told me that they dont carry it.

This is what the humidifier


I bought a humidifier from Available Depot. I used it for 3 months and found out they do not sell the filters for them. They took it back since without the gauze it was useless. I bought one from Lowes and they stock the filters



Germ Guardian H4500 120 Hour Ultrasonic Humidifier

amzn.to Micro-organism Guardian H4500 120 Hour Ultrasonic Humidifier