You know what's been working for me these past couple a times? A can of Full Throttle.
You take an empty can of any flavor FT to the ticket booth and they have you give them the flip tab off the can. Then, they knock off $8 bux off the price of the ticket. Find FT on sale somewhere and buy one can for each day you want a discount on. 1 can good for only one day's ticket purchase.
Not sure if it will keep working, but worth a shot.