Not sure if they can ship at all.
I think this is a promotion that changes.
You can check their website or call the winery. This can vary depending on the time of year and sales they have. Alternatively, they have a distribution with Publix Supermarkets.
That is something you'll have to call and find out. These responses are not from employees, Google doesn't employ everyone. But, in about as much time as it took to post the question, you could have easily Googled their phone number and called them.
I'm not sure if they even offer free shipping, but case discounts help offset shipping costs.
Not sure
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