They are available in pretty much any grocery store wine section that I've seen around here in NC, and I know they are also available in AK. I haven't looked anywhere else. They are a little spendy compared to a standard bottle, but there are some decent (or at least drinkable) brands out there. Next time I go to the store I'll take a photo.

MNS
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YMMV. Viewer discretion is advised.