втридорога(Deliberate transformation of a street trader's cry, "cheap at twice the price' (informing customers that what he was selling would still be cheap even if it cost twice as much), into 'cheap at half the price" which would imply that the price was excessive. wiktionary.orgAbysslooker)
риторическая оценка ситуации(оптимистическая или пессимистическая) a common expression, generally used rhetorically to indicate that a particular situation could be a cause for optimism (half full) or pessimism (half empty Val_Ships)
оба хороши(of two people or groups equally responsible for a bad situation: Do you think Anne or Brian is to blame for their break-up? It's six of one and half a dozen of the otherBob_cat)