According to this MacRumors article iPhone X production is not expected to even start until mid October at the earliest so about all you could expect to find at the Apple Store would be a dummy mockup until probably some time in November and then only if you are lucky enough to catch one on the way out the door with a new owner.

My wife informed me she is going to place an iPhone X order as soon as Apple starts accepting them and says I have her permission to order one at the same time. She assumes, of course, I will be paying for both of them. YIKES!

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If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein