Where can I buy them? Online?
And what is the reason they banned them?

OnLine Sales Link: Kretek Clove Cigarettes

The ban is one of the first visible effects of a new law signed by President Barack Obama in June that gives the Food and Drug The ban on CLOVES: Also known as kreteks (pronounced “cree-techs”). It is believed that clove cigarettes are being considered a "starter cigarette" or a "trainer cigarette" flavored cigarettes, which critics say appeal to teenagers, goes into effect at the end of September (2009).

Here is the full article: Where's the clove?

That's stupid.. I like clove cigarettes. I started on marlboro reds actually... and I found myself liking cloves more