-Enable the move_objects on code and click on the crawling mice on the ground. Delete them. Most of the time, they can sell up to 460 Simoleons.
-Buy a Sky Scorcher Fireworks Kit and let a Sim launch a rocket. Click the "Buy mode" icon just before it hits the ground and sell it for 2,300 Simoleons. Launch it as many times as desired and repeat.
-If you leave food out and do not have a maid, you may see cockroaches wandering around your floor. Enable the move_objects on code and click on the roaches. Sometimes, the message "Sell SRR Virtual Reality Set for…" with a price of 100 to 1000 Simoleons will appear.