Hi Sarah,
I am getting married at Eurostars Blue on 8/31/08. We are just beginning our planning process, so I can't speak to what the extra costs are yet, but I should know more soon. One downside is that they have had 4 different on-site wedding coordinators since I started this process, and I have had to go through the details with each of them! However, we visited the resort labor day weekend 2007 and found it to be wonderful - the food and service was spectacular. If I can be of further help, please let me know.
Lara