Mario & Luigi: Superstar Saga Tips

9999 coins
first, equip one of the bro's with the gameboy horror SP. Then, battle as many bob-ombs around the beanbean castle as you can. you will win red peppers for defeating them.(and the things with the tails that change into a brother when their attacking are worth green peppers) Then go to the nearest store, equip mario with the cobalt necktie and sell the peppers for about a 100 coins each.