American Pure Whey is where I got my last 2 lbs from. I have a contact over there too because the site doesn't list this product but they carry it. THey ship from NC too so if you are on the east coast it's a big plus.
I'm a whey isolate user and have been for years. I used to buy from ATW, but they are in shambles right now and Nutribio has too many inconsistencies in thier product. When I talked to a rep at Nutrabio I was simply told they would let somebody know of my concerns, needless to say I don't order from those guys anymore.
American Pure Whey mixes well, but keep in mind, if you are a whey drinker, casein is going to be on the chalky and thick side to you. I mix mine with pineapple juice and soy milk and I love the flavor. I buy the plain chocolate. PM me and I'll give you the guy's email address and cell. He sells me 20lbs of whey isolate (choc) and 2 lbs of pure casien for 149.99 and it is free shipping. The casien is 19.99 by itself. It does eliminate that enormous morning hunger you get when all you take is whey and you got 8 hours of quality recovery sleep. I only take 25 grams a night about an a half an hour before bed and I wake up a little hungry, but not even close to what I had before. I never wake up at 3am to piss and want to eat anymore either, which did happen when I only took whey protien.
My gains stay decently consistent, so I'm not sure how much it benefited, but I feel like it helps me keep a positive nitrogen balance (because my lack of hunger) while I sleep which has to mean more muscle packed on, so it might be small, but it is worth it.