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Hope this tip is not too old, but I could not find anything in the archives: I have found a cheap source for HEPA filters. When you search for "air purifier" at ebay you can find some types with HEPA filters, that are mainly used by allergic persons.
There are brands like: Aclimat, Honeywell, Kenmore, Holmes etc. These are quite small, but they will do.
I got an Aclimat for 6 Euros.
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