All devices go "out of stock" from time to time, including the Sony. The CyBook has the best Mobipocket support of any eInk device on the market, and also the best dictionary support. Both these things are very important to me personally.
SD card support is, to be perfectly honest, of little or no relevance. I currently have about 300 books on my Gen3 (many of them multi-book "omnibus editions"), and am using about 40% of the internal memory.
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