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Depends on what you're looking for. I dislike the coloured planetary filters myself, but you can get them for $15-$20 each in some Aus retailers, or you can also get them on ebay for a reasonable price. I got my Optolong OIII filter off ebay for a good price after a bit of searching (the prices can vary wildly, so be patient!), and you can also get cheap polarizing filters there as well.
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