All 50 of the world’s iTunes store sell Everest: High Expectations. You can find it easily by searching for it by title or by author (Pat Morrow or Sharon Wood). Here are a few links to specific Everest’s iTune listings.
If you live in Canada, you can go here.
If you live in the U.S.A., you can go here.
If you live in Great Britain, you can go here.