I don't know about the specific site you saw. However, I have ordered pills online, and have been fairly dissapointed. Pills, in general, tend not to work. The only exception (at least for me) was ephedra/ephedrine before the ban. I ordered pills online that "claimed" to contain it legally, but they didn't do anything that I could notice.
If you don't mind my advice, I say don't order them online; you never really know what you're getting. If you're determined to try some sort of pill, at least go to a store that sells them first and speak with a knowledgeable employee. Better still, do a quick search on this site on "diet pills" and read about all the money many of us have wasted on them.
I'm still tempted when I see advertisements for some new weight loss product, but we just really don't need all that. Best of luck to you.
"Act as if it were impossible to fail." - Dorothea Brande