Have any suggestions on planning an affordable Disney vacation?

We are planning a Disney World vacation for around thanksgiving weekend. My family has a time share there so we won't need a hotel but we will need park tickets and plane tickets, most all of the package deals I've been seeing online include accomodations at disney resorts. Does anyone have any ideas for where I can look for deals on park tickets? When I checked the Disney website the quote for 4 days of park tickets alone was close to $800! Geez, I knew it was expensive but there has to be some cheaper way to go on this.