We're on the same boat. I have started a mission to look for some and did buy some products that apparently did not contain protein though, they are full of parabens, linalon, sulfate.. you name it. Of course no protein but everything else. This did not work.
I have been searching on naturally curly, under product reviews, and click protein free. This gives you a list of what products are available that are protein free though, they are available online! AGH! I may make an order tonight, I've run out of options.