You can also call corporate number and reserve it. That is what I had to do.
To get in contact with the employees at Apple directly you should give the store a call but if you want my advice then I'd say buy it 2 days before you want it and apply the overnight shipping at checkout. That could get costly and if you'd rather not do that then you can just do standard shipping and allow about a week for the laptop to get to the store. Your best bet in my opinion is to just go into the store and see if they have that laptop in store already
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