A new optical disc has been developed which supposedly could last for a thousand years. Unlike traditional DVD's or CD's this disc does not use organic dyes, but rather a "stone-like substance" which is etched with a high powered laser. The discs themselves are supposed to be fairly cheap, but I have not seen any prices for the special burner which would be needed to record data.
More info here: http://millenniata.com/m-disc/
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