I recently died my hair "dark brown" which turned out to be a very dark black.. I need to fade it but I don't know where to get a hold of any prell shampoo, which I have been told works the best.

I believe you can find it at walmart. Otherwise you can order it online, and you're right, prell is known to fade hair color..

Prell is available almost everywhere. I buy it at Walmart and CVS.