Internet shopping I would avoid Amazon and Ebay as they are flooded with the tears of all those who thought the were getting a good deal and ended up with a helluva expensive fake. The only caveat being buying from a highly reputable ebay seller or from one of the ebay stores of the websites below.
Fragancenet.com - best site in my opinion and I have never encountered any problems. Can find the Creed scents in various sizes pretty easily here as well.
Strawberrynet.com - I havent personally used but many here recommend it, from reviews it sounds pretty good.
Scentedmonkey.com : best place to find testers, no box or cap, but sometimes 20 dollars or more cheaper if you are pinching pennies and don't mind.