L2D is not that expensive to start off with, so the savings you get from one store to another is not that dramatic. At max, you'll save a few bucks. However, as many others have mentioned, Fenix-store carries a lifetime warranty for the fenix lights. To me that's worth the extra few dollars. David (4sevens) is a stand up guy, and he'll take care of you.
Also, recently there are quite a few posts where individuals were asking whether their flashlights were fake. If they had spend the extra few dollars and get it from a reputable source, they would not have been doubting the integrity of the lights.