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As I say, I'm afraid I don't know of any device which supports SDXC cards - they are still rather a specialist item, and eBook readers don't generally have particularly large storage capacity simply because eBooks are not large. Eg, my Kindle has 3.25GB "user storage"; I have 750 books on it at present, and am using about a quarter of the storage space.
You might like to take a look at the Sony PRS-T1. It can certainly use cards up to 32GB (I suspect it won't support SDXC cards, though), and has very good capabilities as far as zooming goes.
Sorry, but I honestly think you're out of luck as far as being able to use your expensive card goes. Perhaps the place you bought it from would allow you to exchange it for a 32GB SDHC card?
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