Those have been gone for years. That's an easy size to get good tires for, why bother with the ES100?
The replacement for that tire is the Yokohama S Drive. Not the greatest tire, but better than the ES100. And in some sizes, the only decent choice available. For the 205/55-16, Tire Rack lists 172 different tires available. The extreme performance summer ranked tires are all great, probably more performance than any E9 ever really needs.
Now if someone has a stash of 205/60-14 ES100s around, I'm listening...