Easily gain Studs in Chapter IV, Episode 1 by building the first two control panels and pulling the lever on the left side of the room. Continue to pull the lever to collect Studs.
Outside the Cantina, destroy the two fan covers. Also, in Episode IV: Return of the Jedi, use the force on the blue chairs in the middle of the room.
To gain over 50,000 studs, go to the Podrace and use one of the speeders from the start of Episode II. These are great for hitting the pink crystals since they have better mobility. Use Subulba's Podracer when hitting the little poles. It is easier to hit them with a wide Podracer.