Google seems to have launched a new feature in the local pack named “sold here.” It shows, based on your query, if that product is sold in the store, directly in the local pack. This roll out was spotted by Sergey Alakov but was seen also in early November.
You can probably see it yourself both on desktop or mobile, just search for something like [ceiling fans]. Here is a screen shot from my iPhone:

This is what it looked like back in early November:

I spy a new UX test in Google’s Map Pack! “Sold Here” is shown for the query ceiling fans. pic.twitter.com/0GNpewvqbH
— Kristin Tahirovic (@knmille7) November 9, 2018
Also in late November:

Here’s one I hadn’t seen before. Another reason for why the landing page you link to from your listing should have your full product range accessible to G pic.twitter.com/246SYZSS0Y
— Brodie Clark (@brodieseo) November 29, 2018
Forum discussion at Twitter.

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