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Either undercover tourist or maple leaf tickets. Both official retailers for Disney so reliable. There is no such thing as a big discount on Disney tickets, but about five bucks a ticket. It does add up if you need several.
@docdebbi is correct. There is not much of a discount to be had on Disney tickets and you will typically not see a savings above a few bucks until you get to 5 day or longer tickets. (a 10 day park hopper will save you about $18 from undercover tourist)
If you are looking to save money on a Disney vacation, room discounts at free dining promotions are the way to go.
If you do elect to get tickets from an authorized re-seller, make sure to look at the final price including shipping as any shipping costs can erase savings.