Costco or Walmart will often carry it. Many grocery stores (but definitely not all) will have it so it’s worth asking.

My favorite use is sparkling grapes. https://sciencenotes.org/how-to-make-fizzy-fruit-with-dry-ic...

Put (food grade) dry ice at the bottom of a bowl, then a clean cloth or towel (for insulation), then grapes. Ideally our a loose fitting cover over the bowl.

As the dry ice sublimates, it passes through the grapes which will capture some of the CO2 and carbonate the grapes.

Very fun, and much less practical, use of dry ice…

In my local grocery store it is the Fish / Meat department that has the dry ice.

Fairly common in grocery stores. Regular ice also works just fine, but dry ice is arguably better in freezer applications because, while it doesn't last as long, it is much colder.

Grocery stores usually have it, you just have to ask someone.

The next time you go into a grocery store, look at the front and see if you see a dry ice storage box

I get it all the time for camping trips