Which is the best organic shampoo in US?

My hair is falling very badly these days. Can anyone tell me which is the best organic shampoo ( not those expensive ones but reasonably priced) along with the size in oz. and price? i liked ';Shikai'; from wholefoods but there isn't a whole foods near the place I have recently relocated. Is Burt's bee shampoo organic n good?Which is the best organic shampoo in US?
I like Nature's Gate Tea Tree and Lavender. It's $6.99 at Whole Foods or Wild Oats.

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