Several years back my Stop & Shop had been selling 1 liter flavored sparkling waters at 2/$1 as the regular price, but one week offered a sale price of 3/$2. I wish I'd taken a picture of that. Thankfully they were the regular price at the register, but I did spend a lot of time in that aisle staring at the shelf in confusion. And it happened over the summer, so it couldn't have been an April Fool's Day prank.