IMO, I would start with the link the PP gave you to see about booking it directly through Disney to see how that prices out. After that I would consider a rental with a DVC member or use a broker. Depending on direct discounts being offered at the time of year you plan to travel a rental may be the way to go.
As another poster stated he was able to book using a package with an Airline. I guess you could also use a travel agent too.
Best of luck and happy planning! I'm headed to Aulani this year myself for two weeks. My family is very excited