You can always buy at the Kindle store, liberate* them and then convert them with calibre (which does a very good job on Mobipocket/Kindle->ePub). It's actually a remarkable straight-forward process at the moment.
N.B. Liberating your ebooks may be illegal where you live.
* i.e. remove the DRM from them so that calibre can convert them. Apprentice Alf can help with this. Google for his blog.
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