Ticket prices can be found here:
http://www.allearsnet.com/pl/ticketchart.htm
DVC members receive 10% off of the Gate price.
Note that depending on the length of this trip and any other scheduled trips in the next 365 days, the Annual Pass (or Premium Annual Pass) may be the more economical way to go. The AP gets you unlimited access to the 4 theme parks for a full year, while the PAP also adds the water parks, PI and DQ. Basically the PAP is a 365 day length of stay pass.
AP holders also receive a number of discounts. Some overlap with the DVC member discount program while others do not.
The marina packages are available, but prices were increased a bit this spring.
This link from Mousesavers details the plans, but I believe the costs listed are still the old ones. Prices quoted more recently are in the neighborhood of 15-20% higher.
http://www.mousesavers.com/entertainment.html#boating
