I only buy straight monohydrate... I get a deal here from a local shop on EAS simply creatine...
I use EAS cause when I was in grad school a buddy of mine tested a bunch of different brands and theirs was the only one that was high purity....
FYI- I don't like EAS, I think they are overpriced and most of the stuff they sell is crap, but I continue to use the creatine for the reason I related above.