I'd suggest installing Kindle for PC/Mac, and downloading the books there. You'll then find them in the "My Kindle Content" folder on the PC/Mac, from where they're easy to transfer to Calibre.
My "workflow" is:
1. Buy book on Amazon web site and send to Kindle for PC.
2. Open Kindle for PC (which downloads the book).
3. Drag and drop the book from "My Documents\My Kindle Content" onto the Calibre window, to import it into Calibre (in the process of which the tools-that-must-not-be-mentioned transparently strip the DRM).
4. Send it from Calibre to whatever device I want to read it on.
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