I've been doing a bit of research into dust filters for the computer and it appears there are quite a few options. I'm just curious what everyone here uses. I think the options cover most of the filters out there...I've turned on the option to select more than one filter type.
I check the adds at the local store for sponges. The thin ones, multi pack. Cut to size. Great for plugging up holes or unwanted small openings into the case. One pack has enough for a throw away solution if you are not into the fuss of washing them out. Lifetime supply is dobale with a couple of rolls of change.
The air filters are not on special this week, but if you need a back pack can't beat the price. Could probably slice the back up and make enough filters to last till the case was so grimey a garden hose attached to a power washer wouldn't touch it.http://www.99only.com/stores/documents/Sacramento040610.pdf
Most of the time I'm lazy and use jsc's excellent filter solution.