Technically all simoleons are free in The Sims 3 its just a matter of earning, or cheating them into your Sims' account.
To earn simoleons with cheats just open the cheat bar (ctrl + shift + c) and type in the following code - pressing enter when you've finished - depending on the amount of money you want:
'kaching' = 1,000 simoleons
'motherlode' = 50,000 simoleons
Otherwise you'll have to earn the money manually through hobbies, jobs, and other part-time jobs.
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Simoleons is one of the many terms for "money". but in the game Sims 1, 2, and 3, the word Sims pretty much just means "people".
Open Cheat Box: CTRL + SHIFT + C Motherlode = $50,000 Simoleons Kaching = $1,000 Simoleons TestingCheatsEnabled True = Shift on Mailbox for More. View on the internet for The Sims 3 Cheats for more cheats & glitches.
If you mean real money, then no. You have to buy them in game, with Simoleons (Sim cash.)
First your Sims need to travel to China and then go over to the Shang Simla Market where the fireworks are being sold for 75 simoleons.
Either make your Sim get a job or you can cheat and use Kaching for 1,000 Simoleons or Motherload for 50,000 Simoleons.