At the start of Chapter IV, Episode 1, build the first two control panels. After building the control panels, move to the left of the room, and pull the lever. Keep pulling the lever and collecting the Studs. Repeat this as many times as desired.
Use the following trick to get over 50,000 Studs easily. Go to the Podrace, and use one of the speeders from the beginning of Episode II. These are great for hitting the pink crystals because they have better mobility. Use Subulba's Podracer when hitting the little poles. It is easier to hit them with a wide Podracer. You can easily get over 50,000 Studs each time, and it is one of the quickest levels.
There are several ways to get Studs by destroying chairs, trash cans, etc. There are two fan covers on the ground outside the Cantina that give lots of Studs. Inside the Cantina is a location that gives a lot of Studs. In "Episode VI: Return Of The Jedi" is a table in the middle of the room with blue chairs. Use The Force on these chairs several times. Some Studs should appear each time this is done.
Buy the "Poo Money" and "Stud Magnet" cheats. Then, go to Episode V: Chapter 2. Near the end is a ship where you must push two bricks into the slots. There are two animals inside. Get on one of the animals, and go to the top left corner. Face away from it, and repeatedly press Z. Random amounts of silver, gold, and blue Studs will keep coming out and hitting the wall.