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Google seems to have rolled out pricing overlays on top of some product thumbnail images within the search snippets. For example, if you search for [diamond bands] and look at the Costco result, you will see these pricing overlays.
I know Google tested this some time ago, but according to Brodie Clark on Twitter, this is now live in the US search results. I can replicate it; here is my screenshot:
Not all snippets that have these product image thumbnails show product pricing, here are some that do not for the same query:
Forum discussion at Twitter.
