If you're in the US, your only options are to buy seeds locally if you're in a legal state or order them from outside the country if you're not.

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I don't have any first hand experience with Autos & can only go by what I see on the net & breeder descriptions. Many will be very fast, but you pay a price for speed. Generally, that means you'll have a very small result with a small yield although some breeders are making claims that their autos are just as good as their more traditional strains. Pyramid Seeds has some that sound really good, but you might want to look for some logs before you make a final decision. Just about every well-known breeder will have at least one Auto to choose from & more are coming out all the time.

In short, newer autos are much better than older ones, but don't set yourself up for disappointment with unrealistic expectations.