My wife went to grad school in North Carolina. She wasn't much of a drinker (at least that's what she tells me now), but she and her roommate did enjoy a bottle of wine with dinner every so often.
On Monday through Saturday, they could buy a bottle of vino any time the grocery store was open. On Sunday, they had to wait until noon. My wife remembers being forced once to wait 15 minutes before she could check out a large grocery order because her shopping cart included a bottle of wine.
Welcome to the wacky world of blue laws!