Cartamundi's Cardstackers — 825 cards specifically designed for card-stacking. (they appear to be entirely uncoated) They stopped being manufactured perhaps some time after 2010, but can still be found on EBay.
My copy was copyright 2012, so it was manufactured at least that late.
Pla-Mor cards, by the US Playing Card Company — This used to be the favored card for card-stacking. They stopped being manufactured a while ago. Used copies available in various places.