Where can I find these cards in the US? Of course they exist, but you might have to look very hard to find them actually being sold in the US. There probably is not enough demand for them to really be imported.
I couldn't find them on Amazon, which means they don't exist...but I know they do...
If you want to find them on Amazon, you just have to look at the right one: http://www.amazon.de/s/ref=nb_sb_noss_1?__mk_de_DE=%C3%85M%C...