Paper Mario: The Thousand-Year Door Cheats

Good money and cheap Jammin Jelly
Easy Money
on Keelhaulkey right when you enter go to the left untill a blue mole appears. Hit him on the head over and over again. If you leave the area he will come back. Every time you hit him you get a whackabumb. I think you can do that 15 times but I dont know. Once you have as many as you want go on the train and sell them to the shop manager for 100 coins a pop! Veary good money.
Cheap jammin Jelly and Ultra shroom
Buy it for 120 coins from the guy outside the shop that has the red cloths on and looks fat. If he doesnt have them then go underground and then come back and he will have different things. Keep doing that untill they apear in his inventory.