I recently purchased a Baofeng UV-82 from a seller that advertised it as an "...Upgrade 8W". There are a fair number of these on Ali Express.
Assuming it was a UV-82HP and the seller got the listing wrong, I ordered it anyways, but no, it really does say UV-82 8W on the back.
What's more is that the radio does indeed have 3 transmission power options (low, medium and high) in the settings, and when I spoke to a local seller and they say that they sell genuine 8W UV-82 radios that they import directly from Baofeng.
However, I've been unable to find any mention of this on the Baofeng website, and there aren't any genuine mentions of this online.