See Sam Costa photos starting in 2008 on the Indy Runners Facebook page.
For 2016 Sam Costa photos, you have two choices. Ultra Event Photo took professional photos available for purchase here.
In addition, David Scovel captured some photos that are available here
David's photos are not high resolution. If you would like a high resolution copy, you can email him at dscovel [at] comcast [dot] net. However, please allow a few days for a response.