Sacramento on the California Zephyr in March. No discount on the way there because we'll have a roommette (first time), but the 20% helped out on the return trip in coach.
We were going to drive to Chicago in March, but now we're taking the train. We only get the discount in one direction, though. They advertised 20% off Michigan services, so I'm not sure why we get it from KAL to CHI but not CHI to KAL. I need to look at the fine print.