If you are looking strictly for powdered creatine, you might want to give Pro Performance a try.  (its the GNC brand)  I began taking creatine about 4 years ago and have been on and off since then.  Pro Performance was the first creatine I tried, and honestly, I have stuck with it faithfully since, despite the newest innovations in creatine.  Naturally, I tried to stick to 5g a day, and was sure to drink a high simple carb drink before taking it as to spike my insulin.  You can select from a bunch of diff. sizes and w/ the gold card you will end up getting a good price for what you buy.  Give it a shot, it has been great for me.