The best deal for your dollar is to purchase your tickets in any format other than single day passes, or simply the more you play, the better the deal, with the best deal a ten day ticket.
A single day one park pass is currently running around $79 for an adult, a ten day pass $243.00, which means the average price with this option is only $24 a day. If you are unable to stay that long, but plan on visiting again in the future, be sure to ask about the no expiration option. For an additional cost, you can add the no expiration on a multiple day ticket. You can then visit again anytime in the future with the same ticket and enjoy the savings.
Many Disney packages have the savings of a multiple day stay already figured into the package price and will still save you some money over buying each day's tickets separately. You can find information about the current price table and add-on options
here. For a great detail explanation on the best ticket options visit www allears.net under Theme Parks and Ticket FAQ.