hmmm I think I should first just say that there is no "creed world" there is only a complete "niche world" in fragrances. Creed is often times a gateway drug for people who begin to get into niche, some people absolutely think they are the bottom of the barrel of niche, others think they are some of the best. Either way all I am saying is I wouldn't limit your niche purchases to just Creed.
Now that said, there are a lot of places you can order samples from, those sites being
www.theperfumedcourt.com (complete rip-off in my humble opinion, but I will even admit their selection is amazing)
There are also some places where you can purchase decants (1-10ml atomizers of a perfume), but these aren't allowed to really be discussed here.