I also use whey protein. I made the switch from soy and I like it much better. A friend who I trust very much recommended the 365 brand from Whole Foods (not sure if you have a whole foods store or not). It's inexpensive because it isn't a "name brand", but it's also made by a natural company, so it's not jam packed with crap either. I just get the vanilla because I add coconut oil and frozen berries to mine.
I couldn't find anything specific on their site about their products, but
here's information about their line of products and you should be able to find out if there's a store nearby. Hope it helps!