These are now all free @ iTunes as well (linkage edited into the OP), and seem to be available in many places worldwide when I spot-checked the UK and Denmark and Japan stores (but not in Iceland or South Africa, which don't even have the listings).
So in case anyone's been having geographical availability issues (still not free at Amazon UK when I checked just now) and has a working iTunes install, you should be able to grab the DRM-free ePubs from them (as long as you're not in Iceland or South Africa, I guess).
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