Posted March 6th, 2014, 09:55 AM
Pretty standard this day and age...
"...In the event that the tour or price quoted or advertised through any website, Carnival’s sales person, sales agent, or any other source is booked, but is incorrect due to an electronic error, typographical error, human error or any other error, causing the tour or price to be listed, quoted or advertised for an amount not intended by Carnival, Carnival reserves the right to correct the erroneous price by requesting the Guest to pay the correct price intended, or by cancelling the tour in exchange for a full refund, but in no event shall Carnival be obligated to honor such tour booking resulting from the error, or otherwise be liable in such circumstances."
I'm sure there's something similar for cruise bookings also.
Read this case, Perez v Hung Kien Kuu,