Their packages are based on minutes - X$ for 100 minutes, Z$ for 200 minutes, *$ for 50 minutes type of thingy.
If you just go in and start using in the internet room, with no package, you pay 75 cents a minute, I think. If you get packages it's cheaper. Starting price without a package in the stateroom is 50 cents a minute, I think, but remember it's a slower connection in the stateroom.
It's been a couple months so numbers are getting fuzzier...