Product Snippets with JSON-LD + Schema.org - Are there any live examples in Google index?

Update 2016: The documentation got updated and it no longer contains the note. So now JSON-LD seems to be supported for the Products Rich Snippet.

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Google’s documentation for the Products Rich Snippet says for the single product page:

We are in the process of implementing JSON-LD support for this Rich Snippet type. At the current time, we recommend using microdata or RDFa.

So this might explain why it wouldn’t always work, currently.