The jelly marbles are made and sold by Steve Spangler Science. They are $10 for about 1000 marbles (50 g) and kit.
See related link "Jelly Marbles" for more information
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You can get them at stevespangler.com for 12.99 or something like that
That would depend on how many yellow and blue marbles are in a pack. If yellow and blue marbles are sold separately and there are the same number of marbles in a pack, buy one of each. That's probably not the case.
He will have 13 blue marbles and 10 green marbles.
12 blue marbles
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