When I was using supermarket products I found them to be more detergent like and I was using more of it so spending about the same as I am now anyway.
I agree with Eluned. I used to buy supermarket products but i found i would need to use sooo much of it that in the end i was paying as much if not more than if i used salon products. Iv found a product that i really like and i can buy it in the gallon so although its expensive as an initial outlay i prob wont need to buy it again for a year. I only need to use a tiny amount and my hair feels so lush and lovely.