Enable the "Free mode" code, then move your Sims into the cheapest house available. Then, buy a lot of expensive items (such as the Monkey Butler). After this, evict your Sims from that house, but do not empty the house. By doing this, your Sims keep the "assets" that they had, which turn into money for them. The house will then cost something similar to 99,999 Simoleans. To counter this, enter build mode for the house you moved your Sims out of, then sell off the Monkey Butler and other items you put up. The house will be cheap again. Move your Sims back in and they will have a lot of money.

Enable the "Free mode" code, start a game, and buy fifteen Heart Hot Tubs. Note: These must be unlocked in Get A Life mode first. After buying them, save the game and quit. Turn off the PlayStation2 to disable the code. Return to the same game and sell all the Heart Hot Tubs that were bought to get up to 99,999 Simoleans. Notice that when you pay bills, buy something, etc., your money will not decrease.

Enable the "Free mode" code, then go to your house and buy a lot of expensive items. After that, save then restart your system. Do not enter the code again, then sell your items back for more money. The best item to do this with is the Monkey Butler Tree, which is worth 15,000 Simoleans.

Make a wall parallel to the sidewalk (with the trash can and mail box). Put the most expensive wallpaper on both sides. Then, press Square to sell the wallpaper on one side. If this does not work, try the opposite side. You should be able to sell one side's wallpaper repeatedly.