I buy the rolls of the blue stuff for like $5 a roll. Then I poke a hole in the center and slide it on the rod. Then I just cut around the red circle with scissors. You get a ton of them. They are a different type of material though. Its not as sponge like. It's really for filter trays. But its works fine. It actually traps more detritus, IMO.
But I only use a little media and change it often. If you left it in for a while it may get clogged. I don't know about that.
If you can find a material that is more foam like than the blue boned rolls, it would work even better. I used to have these blue foam blocks, they were for a canister filter or something, they were perfect. But I can't find them anymore.
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