Lettuce

I just read a consumer report on the bagged lettuce we buy from the grocery store. I like the kind with various types of lettuce, carrots, etc in them. You just dump them in the bowl and put salad dressing on them and you are ready to eat. BUT, I am sure everyone notices how quickly they spoil. They should be good till the sell by date but good luck if you get a couple of days out of them. They tested 62 bags of all kinds and the reports weren't good. I guess I will stick to buying head lettuce because then I know it isn't gooey and icky in a couple days. I love a good crunchy lettuce salad but I seem to be throwing money away on the beautiful bagged lettuce. How about you?