Discount tickets for Disneyland or Universal Studios can typically be found through AAA or even at a local Costco. But members of the military, school teachers, college and other students, as well as employees or certain companies can also find discount tickets through other sources.
The important thing is to confirm the source is reliable. Be wary of tickets sold secondhand—you might find yourself at the ticket gate with a pass you bought at full price only to make the unfortunate discovery that you can’t use it for one reason or another.