Brine shrimp are sea monkeys, which you can find all over the place (but you don't want to pay the money for the sea monkey name). They are really easy to hatch! The easiest thing to do would be to go to Petsmart or Petco. They sell the brine shrimp eggs with instructions and everything. They also sell hatcheries for $20 bucks or so that include the setups needed to hatch them. If you don't want to buy a hatchery, you can accomplish the same thing using an empty soda bottle, an air pump and an air stone.