Well, the US stores are selling Christmas decor in October (at latest) so being a few weeks early on Octoberfest beer is excusable, I guess, but I was surprised to see it this early. BTW the store I bought it from is already sold out and not expecting more according to the clerk there. I bought the last of it.
I've found it best to just not let Octoberfest end and have a continuous celebration... With no more dates to remember, I can concentrate on the more important details.