There's a few threads where this is mentioned already, just check for storage solution threads,
this thread has some stuff on the second page.
Me, I just wrote and cut mine out by hand on brightly colour-coordinated nice thick card, rounding off all the corners and stuff. Printable card was just too thin and flimsy when I tried it. Mine don't have all the extra info on them like prices and sets, but I don't need that stuff for my purposes.
