There might be good reason not to do this, I don't know. There is a recent proposal to tag products: sold: http://wiki.openstreetmap.org/wiki/Proposed_features/Sells Have a look at the discussion on the tagging mailing list on the subject: https://lists.openstreetmap.org/pipermail/tagging/2016-March/thread.html#28782
It looks controversial.
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