Just got off the Emerald. We wanted to book St. John's/USVI but it was sold out prior to sailing on the app with no wait list options. Once on board the tour was available to book via app with no problem.
Not sure why those lower prices show up, maybe in conjunction with a package. We bought 2 8x10 already printed pictures (the one they always display on deck 7 or so) with also digital download for$ 48.52