In case you get to that end of your "to read" list
, apart from the commercial ebook copies there is a free epub in the New Zealand Electronic Text Collection** and a passably good (from the little I checked) reading of it at LibraVox which I may listen to one day. And a yellow paged PDF at Archive.org.
**Unfortunately the NZETC uses TEI markup standards which result in messy and extravagantly built epubs, but are usable (however, I take the trouble to rebuild them to my own tidier versions if there is no other free source).