For all the following, assume non-trivial production runs (1000+ units):
What is the approximate cost of adding small painted wooden pieces to a game (1cm cubes, cylinders, simple houses, etc)?
What is the approximate cost of adding wooden 6-sided specialty dice with to a game?
What is the approximate cost of adding a quality full-color 60-card deck?
As far as I know there are no approximate costs for much of anything. your best bet is to get a quote from some manufactures, or look at what other start up companies can put in a box and see how much they charge for it.