If you are in the area of the theme park most of the time the soda cans in your area have the coupon on them or you can try the website.
Finding actual coupons for Universal Studios on other websites seemed to be an exercise in futility but the company does actually offer discounts on their website that gives various discounts. There is one particular deal going on right now that offers $10 off of general admission plus the second day admittance is 100 percent free. Looking at the Universal Studios website they rotate several deals through their company all the time and there are always deals that people who want to visit the park can take advantage of.
Of course even with the discounts it is not exactly cheap to make it into the park. The California tourism board does offer some discounts from time to time and that is another site someone can check.
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