I don't believe Amazon
will let you preorder the new Surfaces.
Moreover, I don't believe Amazon
itself ever sold the Surface; I seem to remember any listing on Amazon
was by a 3rd party through Amazon
fulfillment, and some of the early reviews there commented on the significant price markups. And the first gens through these 3rd parties now could be refurbs, who knows.
So far, the most common places to preorder are through Microsoft itself and Best Buy (U.S., don't know about other countries).
Of course, if you do have all that extra credit as gifts and don't mind being potentially gouged, Amazon
's 3rd party sellers will most likely start listing the second gens after the release date, which is Oct. 22.