There are many places to save on your trip and even Disney has discounts at different times of the year. Approved Disney Travel Planners are the best way to find out the best way to save for the time you want to go. I use to book myself but why do all the work if someone else can do it for free. The solution is to find someone you know will work hard at finding the best deal for you. I have met many people at different travel agencies that will do a great job for you so check with others to see who they like to use and have had good luck with.
I myself would trust a few of them but there is one I use now because they were nice enough to offer my readers something special. Magical Vacations helps my readers find the best deals through Disney or any other deals available and they offer my readers what we call the Tiki Plan.
If you want to do the work yourself than I suggest starting with Mousesavers.com. This has always been the best place to find out up to date information and advice on saving at Disney.
For planning the rest of your trip (besides staying at the Polynesian) you should visit Allears.net. This site will give you information on all the parks, resorts and restaurants including all their menus. This is also where Mike Scopa is hiding out now!
Once you get into the parks if you have not already purchased The Unofficial Guide Walt Disney World than you need to visit TouringPlans to know how to play our your day and spend more time having fun and less waiting in line.
Visit my Links page for more helpful links to plan your trip.