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You can go to the Apple online store, order the phone with the exact color and options you like. When you go to close the transaction, instead of shipping the phone, you can check to see which stores in your area have that specific model in stock. You can then stop the purchase if you are not ready to buy. OR, if you want to make the purchase, do so and select the option to pick it up at that specific store. They will have it waiting for you. From your iPhone you have a receipt and a bar code that can be scanned at the store. I did this recently when I bought a new iPad Pro for my fiancee. It was very easy.
Question: Sale of IPhone X