Ah you mean Unilever, the company that was caught dumping mercury in a densely populated part of India? Or the same one responsible for deforestation of Indonesia and using a palm oil supplier that used child labor? Or perhaps the same Unilever that is one of the top 10 polluters on the planet, which lobbied in India and Philippines to prevent a law banning single use plastic? Or maybe the same Unilever that had salmonella contamination in their products and refused to release information about which product dates were affected? Or the Unilever that was accused of price fixing in Europe and was later fined for the practice? Or maybe the same Unilever that pressured Cosmo magazine to fire a Sri Lankan editor for refusing to promote their skin whiteners? Or maybe the same Unilever that ordered security to fire rubber bullets and pepper spray at striking workers in South America? The same Unilever whose founder used Belgium's Congolese workers as forced laborers for nearly 40 years to create his empire (if you're not sure why this is an issue, just look up Belgium's exploits in Congo)?
Oh, it's all the same Unilever? The same criminal parasites that cooperated with an imperial empire to "employ" slaves that were being genocided doesn't have any issue with doing business with a country that is using Imperialism to genocide another group of people today? Well color me shocked...
I also can't use products with SLS. I really like Yardley London soap, but it's not cheap and I'm not sure if it comes as a body wash. Smells great though.
Depends on your location, but I use SLS-free bodywash and I buy it at those drug store style shops like Rossman in EU, Shoppers Drug Mart in Canada or Walgreens/CVS in the US. There is usually some sort of store brand that offers it and it will be relatively cheap. Another option is to get those super organic soap bars with like absolutely nothing in them.
Another thing you can do, if your hair isn't naturally too oily, is to just wash it less frequently. I was my hair 2 times a week max these days and it honestly looks better than it ever did before. A small bottle of shampoo lasts me more than six months these days.