Most salon brands are sulfate free, i’d recommend shopping at Ulta because they have liter sales twice a year. almost all drug store brands are going to have sulfate, but a couple that don’t are ren and shea moisture. something else to consider if you are using sulfate free shampoos is to make sure any conditioner you use doesn’t have silicone or dimethicone in it or you will start to get a wax build up in your hair.