I was able to locate the old formula at Trade Scret for 11.95 for the 16.9 oz. I also found it at the local Meijer super store at %50 off for less than 6 bucks for the 16.9 oz.
I hope you got the old formula protein plus shampoo without the SLS in it. That's the one I rave about and use (big stockpile at home
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I use any conditioners with the lanza shampoos (I have the deep cleansing too). I have used the lanza Straight Line conditioner which is a good 're growth straightener' that I keep saying I'll re-purchase when I get a chance.
I have the Lanza Moisture Treatment from their Dry Line but (shock horror) haven't got round to using it yet.