You can buy samples from rorschuck here at B&B, www.badgerdecants.com, or from www.theperfumedcourt.com. As has been stated, check www.basenotes.net for reviews and details. Bois du Portugal is a fantastic scent, in my opinion.
+ 1 on the perfumedcourt.com
I wouldn't buy retail because in the past couple years there prices have skyrocketed and although I love Creed I wouldn't pay $250 for 4ounces when I can buy a authentic one at costco.com for $139.99. That is such a difference that you can buy a membership at costco for $50 and still save $60.
I remember my first bottle of Silver Mountain Water was $70 for 4 ounces online. Now it is almost double online.
Saks and Neiman Marcus in my area carry it so I try it there and then buy online or at costco.com.