Whenever I get low on shampoo and/or conditioner, I go to the store. I walk through the shampoo aisle and I read all the labels. I may or may not sniff most of them too. I ponder whether or not each brand and variety really will give me fuller or shinier or softer hair. Then I grab the Suave. It's not the absolute cheapest, but it's by far cheaper than most others. And that's what I use.
Not that I don't dream of the day when maybe I can justify Herbal Essence.
You guessed it: my hair care is quite ordinary. But at least I have clean hair.