I just started using Trader Joe's Refresh Citrus shampoo. For $1.99 you can't beat the price and it does clean in a citrusy way. I'm not sure you'd want to use it daily, as it isn't very moisturizing. So alternate usage to avoid an over-oily hair.
You'd think for the price it would do a crummy job, but it's great. My family and I love it.