By Harriet Morphy-Morris When it comes to saving money in the kitchen, brands including Ninja, Instant and Tefal stick out to money-conscious shoppers, as it’s become a well-known tip that ditching a conventional oven for worktop gadgets like air fryers can help cut energy bills. And to make the savings feel even bigger, one popular Ninja air fryer has dropped in price. The Ninja Air Fryer Max can now be bought for a lot less as it drops by £90 in a seemingly discreet sale. The one-draw device was originally £189.99 but if you add to the cart now you’ll get it for a much cheaper £99.99 price. …