Looking at the website, I'm thinking that the cost for the service, if any, is set by the hotel where the Printme printer is located. I selected a particular hotel that I've stayed at in the past and the hotel info screen showed "call for cost" and the hotel front desk phone number.

A little more searching and I found that another hotel (the Westin in Long Beach) shows a charge of $1.00 per page in color or B/W. Most hotels don't have any price information, though...