Muscle Bulk Building Supplements

So I have been working out for around nine months now and trying to build up some bulk.  When I was younger I was never able to put on any bulk no matter how hard I tried, I was alway lean with not much muscle mass.  Now that I am older and my metablolism seems to have slowed down a bit I thougth it might be easier but no luck yet.  I have been researching natural alternatives online and came a across a site that has a wide variety of discount nutritional supplements.  I have specifiacally been looking into a cheap creatine source because I read up on it and it seems to help increase bulk safely.  I am crossing my fingers this time and will have to research it a little further till I am sold.