I know I sure have!
Luckily for you, I found two videos which answer our mutual question on this website here. It's an interesting comparison of how playing cards are manufactured in the US (actually Belgium) and China. Both videos worth watching, if only for the super-speedy-card-packing-into-boxes guy at the end of the China one and awesome robot-ness of the 'US' one. Unfortunately, I can't seem to embed both videos, so you will have to watch them on that site I mentioned above. Or, you can watch the full version of the US one here (it has an awful, non-sequitur pun at the end – almost worth watching).
Why am I interested in playing cards all of a sudden?
Love from Jacob