Amazon offers downloads of Hugh Howey's Wool: Omnibus Edition (Books 1 to 5) eBook for Kindle for $3.99. (The eBook for iPhone, iPod touch, or iPad costs the same.) That's $2 less than Google Play's eBook for Android or Barnes & Noble NOOK costs, although we saw it for $2 less last fall. A Kindle reader, or Kindle-enabled device, is required to download and read this eBook.