Officially, October 5th is the street date. There have been plenty of reports that stores will likely have them sooner than that, it's just a matter of how soon they put them out.
It's probably worth phoning stores just to see if they have them for sale, or when they plan to. I'm going to phone my local Chapters store in the morning to ask them when I can pick one up. It's not uncommon for street date to be broken when the product is already being sent to customers through other means as well.
I too am looking forward to getting one and hopping on the e-reader train!