HD service - XFinity

I have a digital starter package with an old school motorola SD box and I'm looking to upgrade to HD.
1. Can I visit any comcast location to receive a new HD box? Do I have to have my SD box in hand in order to get the hd box?
2. After setting up the box will I automatically receive HD service with the digital starter package I have or do I need to upgrade my package?
3. In the Chicagoland area is there a flat $9.99 a month extra for HD or are there additional fees?

Thank you!

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