70th and Havelock in Lincoln, NE has a Casey's on both the NW and SW corners. Eagle, NE, which is the first city east of Lincoln, has 2 Casey's on US 34. I believe in both cases, one was originally built by Casey's and the other was one they bought.
Here in Mason City, we are down to 3 Subways, 2 of which are the one just outside Walmart and the one in Walmart. Starbucks is both in Target and in the small shopping center to the west of Target.