Easy Bertie Botts Every Flavor Beans:

When you exit of the Gryffindor Tower notice the object in the corner. Hit it with Flipendo and three Beans will appear. Go around the corner and walk at least three steps away. Return and cast Flipendo again to get three more Beans. Repeat this to get as many Beans as needed. Use the Nimbus 2000 Broomstick and fly above Hogwarts. Fly through the rings to get free Beans. A blue ring gives 10 Beans, a yellow ring gives 1 Bean, a red ring gives 3 Beans and a green ring gives 2 Beans. At the beginning at Ron's house is a tool chest in their barn. Every time it moves on its own means that you can shoot it with Flapendo to get more beans.

Go to seventh floor. Go to the jar next to the picture. Shoot the jar three times. Either one or three beans should appear; or a pie. Walk as if you are leaving and go to the moose head. Go back to the jar and shoot to get more. Repeat this as many times as needed.

Once you get the key to the Confiscated Items room, go in there and get your six Wizard Cards and your 200 Bean Bag. After you run out of Beans or are low on them, go back to the Confiscated Items room. The chest that had the 200 Bean Bag, is closed again. Reopen the chest and you will get a refill of 200 Beans.
When you have the key to the Confiscated Items room, just save and reload and the 200 Bean Bag will be back. You can repeat this every time you need more Beans.
When you go outside of Hogwart's, go to the tree where you walk through a long hallway and Flapendo it to get as many Beans as needed.

Go to the Dueling Room and walk down the stairs. There should be someone that is standing to the left of the room. Go up to him and duel him. When you have defeated him, there will be another person standing next to him. Keep defeating the people until you reach the last person. When you have defeated the last person, duel him repeatedly until you have the desired amount of Beans. If the last person is too difficult to defeat, then go to the second to last person (to the left of the last person), and duel that person repeatedly.
On the second day (not night), go to the Quidditch Stadium and get an C, B, or A grade and keep your Nimbus 2000. During the day, you can get on your broom, go through some rings in the sky and get Beans, as follows. Note: If you can manage to fly through a ring slowly and turn around and speed up, you can go through that ring twice. This will not give you twice the beans, but two new rings will appear instead of one. It is possible to fly through a single ring up to four times, but it is very difficult.

Gold Rings: 1 Bean
Red Rings: 2 Beans
Green Rings: 5 Beans
Blue Rings: 10 Beans
To get unlimited Beans when you are in Hogwarts, go to the Second Floor Charms and Library area, located off the main staircase (preferably at night). As you enter this area, go into the second door on your left, then take the first door on your right (being careful of the Fire Crab). Once in here, there are three wooden boxes that release Beans when they are Flippendoed. They will release about ten from each box. When they are dry, exit this room then immediately re-enter it. Hit the boxes again. Continue doing this until you are full of Beans and return at anytime to fill up again.

On the seventh floor of the grand staircase, go into the Arithmacy class and hit the small globe three times to get three Beans, Walk out and in again. Repeat this until you have enough. Then, go to Fred and George's shop and buy and Bertie Botts Bean Bag to be able to get more beans. Keep collecting Beans to afford anything desired. Note: Watch out for the ghost that haunts the class. Do go near her or risk losing some Beans.