Some stores still have £1.90 or even £1.85 labels on the shelf, but if you get the prices adjusted at checkout the 4 for 3 discount also reduces, making it less worthwhile complaining!
Yesterday was the first time I'd seen it. Presumably must be priced significant cheaper at Sainsbury's as the cashback amount was only £1.35 to try it for FREE.
Perhaps like the Waitrose offers it'll reappear later in the day?