One of the best things that has been invented is salad fixings that are in plastic bags ready to use. This means one can make fabulous salads made of mixed herbs and greens in about 30 seconds. I don't even know that it's really all that more expensive and it certainly encourages the eating of salads. And it's a life saver if you have been asked to take a salad to a do for a gazillion people.
I'm a regular consumer of the instant mixed salads in bags. I think it's probably the most expensive way to buy salad but my alternative is to buy several different types of leafy herbs etc. and have half of it spoil before it was used. Some of the more unusual ingredients in the mixed salads I can't buy locally even when they are in season. Every time I eat salad I count it as another victory over my belly's repeated attempts to escape over my waistband.