I'm sorry, but I'm in Puerto Rico now and I have no idea how much it can cost, plus I've never had iphones. You must go through the store of your company of preference.
With each Apple store you need to call first. If they do not have something, they can tell you where to get it. Bit for that, you sometimes need to come in and chat with them.
I do not have this information, because I am a tourist and not an employee
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