http://www.bodybuilding.com/store/dym/elite.html
I go with the rich chocolate, tastes great
the stuff at Sam's is disgusting, and GNC is way overpriced. I've always ordered that stuff, from that site, and been happy every time.
With protein though, you can overdo it, just as someone was saying earlier. It is slow to digest, which means if you take in too much of it at once, your body will decide to get rid of it the fast way and dirty way. One shake (around 40 grams of protein) every couple hours, at the most.