Cardstock??

[Wasteland Jack]

I only did this once so it might not be the end all be all.

For actual playing cards I used bristol board, cut for printer size. It is a little thicker than the normal cards, but I think thinner than cardstock.

For directions, rules and player aids I print out on normal paper and then used the 3M Laminating sheets to cover them. If you go this route make sure you print the images a slight less than 8.5X11 so that when you laminate you have a good 1/8 inch of border around the document for the laminate to seal correctly.