Need help finding filter material for kitchen hood

[nyker96]

Hi, I installed a new cooking hood in my kitchen about a year ago and now the spongy filter material is dirty and clogged. I tried several places (HomeDepot, Sears etc) to find replacement with no avail. I originally bought this at HomeDepot but they don't have the filter replacement any more. I wonder if anyone know a site or place to find those spongy filter materials. Even bulk will be fine I can easily cut them down to right size. Thanks!