Weirdly, it seems to currently be free internationally at every single Amazon regional store I've spot-checked, including Australia, Japan, India, Brazil, Mexico, France, the Netherlands, etc. (except China, where it doesn't seem to exist), except for the US (where it was free for a while earlier). I guess it's just one of those glitches which sometimes happen when a book that's meant to be a multi-store multi-country promo just doesn't co-operate at Amazon for whatever reason (this usually happens with Open Road freebies at Amazon CA).
Unfortunately, this doesn't even exist in any of the other retailers thus far (at least not ones that I can easily look up from a Canadian perspective), so you can't do the Report A Lower Price thing although it might possibly drop back again later since it seems to be intended to be a worldwide promo (unless this is just a sudden expiry that went through in the US first and international Gentle Readers (or those considering pretending to be) should grab it while it lasts)?