Regular ticket prices vary by park. If you go to sixflags.com, you can find the cost at your local park.
For discount tickets, you can call the marketing department to see if they have any other promos. That usually works very well.
For daily tickets directly from the website, you can use promo code "homedepot" to get them for a good discount. If that's not working, you can use "mycokerewards" for a discount.
If you buy four tickets, use this link to get them at 4 for $99 (plus tax) using Chase credit card.
Hope that helps!
FYI, what's nice is with your season pass, you also get a bunch of other discounted admissions.