It should come in multiple parts... It was published as an 18 part serial.

Try Gutenberg.org , it’s in public domain.

I'd say your best bet is to get it from the Folio or Poche publishers. I saw that Poche have a two-volume edition, which might be your best bet. They're usually decent and not expensive. I don't know if there's a single-volume edition in print from an affordable French publisher.

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