That page is not letting you choose between pickup at the Post Office and delivery to your door.Some hatcheries now are giving the option to have your order delivered to your address,
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It lets you choose between pickup at the HATCHERY or shipping to your local Post Office. You will still have to pick them up at the Post Office-- which is explained on the hatchery's "shipping" page.
If you choose the option to pick them up yourself, it gives you the hatchery's physical address and hours to pick up your chicks. And the shipping charge goes away.