If you haven't yet checked Kings Island's website,
here , you can buy your tickets online and save $11 on the gate price. You can print your tickets at home.
Groups of 15 or more are eligible for group rates, so if you happen to pick up a few more people, you'll save money that way, too.
I'm still waiting to hear back about others discounts. Coca Cola ran a promotion locally with Paramount's Carowinds in N./S. Carolina and with Kings Dominion in Richmond. They may be doing the same with King's Island. I'm not sure what the promotion was, though.