The articles you buy at one of many of Zack's shops can be very expensive. Earning 
the money is easy in one particular area -- the "Marina Race". Play this in the 
morning, noon, and night for three days to earn up into the millions of dollars.

You can try to double your money on either blackjack or roulette in the casino. 
Go for the maximum bet of $1,000 and bet all of your money. If you lose, power off 
the game and restart it for that day.