COPAGs

I bought my first deck of Copag plastic playing cards about a year ago and haven't played with anything but Copags at my home game since. Actually I gave away a deck. So I've been playing with this deck for at least 6 months.
If you've been playing any amount of cards using the cheap Bicycle playing cards, you'll know that these cards don't last very long. At most two games of poker is all they can take before they need to be thrown out.
Plastic playing cards last thousands of games. They are hard to mark, tear, or otherwise damage.
However if any cards do get damaged, KEM and COPAGs offer replacement cards.

Rochester Chess Center has the best prices for plastic cards... And probably chess stuff too, if that's what you're into.