Umm... Velorution?

From trading standards.

I think you'll find that this qualifies.

The buyer cannot insist that a trader sells anything at the marked price, whether or not the trader has made a mistake. However, action can be taken against the trader for giving a misleading price indication. A number of unfair pricing practices are banned.

And this also qualifies...

I don't Think velorution was in breach of any trading laws