iPhone 6s Plus price drop

Probably not. I've not heard of them doing so in the past but who knows. 

As long as you are within 14 day, they might.  Our local stores do, (without a restock fee).   It may depend on how you purchased the phone.   If you bought online, they might be less willing.

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@zefes01 wrote:
... Can I get the actual price for the iPhone?

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You got the actual price at the time you made your purchase.  Analysts and industry experts have been saying for weeks that you should expect an iPhone release announcement about this time and you should not purchase a new phone unless you had to have it at that exact minute.  As others have said, generally AT&T does not price match previous purchases, but depending upon where you purchased your phone, you might be able to convince a store manager to refund your phone and sell you a replacement.

Was the purchase within 14 or 30 days? Thanks in advance for your answer. It would be very helpful for my situation to know.

@star21fish On Sept. 8th, they said 3 days ago.

I believe 14 days is the magic number, check your receipt.