Another data point: I sail on a 10 day cruise in two days and I am elite. My app is giving me $249.90 for single device, full cruise, and $449.90 for 4 devices. I'm not sure why it's $45/day instead of $40 as others claim on this thread. These must be pre-elite-discount prices so I'll be paying roughly $22.50/day for 4 devices which is $5.62/day/device which is fine. We'll share the 4 devices among 4 individuals. I usually purchase on board first day - if my discount is cabin credit that's fine - all comes out in the wash.
So is it $40 or $45/day?