There was a Big Boy about 15 miles away from where I live now, but it has been gone for a long time.
According to the Google, there is be an Elby's Big Boy maybe 35 miles or so west of me, but I can not confirm that, I will have to swing by the address some time. But looking at a map it looks like it is a roofing company that is kind of out in the middle of no where.