Bargaining Cow Breast Milk Cheats

Alarm clock
During gameplay, plug a controller into the 3rd slot of the gamecube. Then with that controller, UP on the D pad. This will give you the alarm clock without being in chapter 2 and befriending Grant.
Mega Money & Mega Items
What you have to do is have two controllers, one in the first port of your GameCube, the other in the third port. Every time you press START on the controller in port three, you get 10,000 G.

In addition to this, if you press Z on the controller plugged into port three, you get all or most of the items.

But it should be noted the code works only if you are not in the pause menu (or the 'ruck-sack').