Starved Rock Runners can get a discount on the Starved Rock Country Marathon/Half Marathon. See below. From Race Director Matt Skelly:
We have been asked about links directly to the marathon sign up site, here is one. If using a promo code, like Starved Rock Runners can use srrl16 and get a discount. be sure to enter promo code when prompted to do so after clicking the green register bottom on the home page here. The prompt will appear at the top of the box asking you to chose the races and will be in blue.