How much additional fuel will be needed to get them to Jupiter?
With the following assumptions:
The weight/mass of the figurines can be calculated as 0.05782 lbs or 26.23 grams:
You can calculate the launch cost of the figurines to be roughly $1,060.
As for the fuel requirements, I could not locate a source for the amount of fuel required per pound, but it should be fairly easy to come up with the answer if you have that number.