Get the Deadlyrang, then go back to HQ. Go all the way to your top left and someone will be there. Jump over to that side and there will be a big red button. Hit it, and it will open up a range where you can test your new Rangs. Inside the range are bags with money. Some you can get only with a particular Rang, but the Deadlyrang is most effective. It can crack through rock, ice, and the metal barriers. After you get the bags, go into the Bunyip Shop just outside the range. Come back out and the money bags will be back. Repeat this process as much as desired. This is an easy way to get money for Rangs.
Ty The Tasmanian Tiger 3: Night Of The Quinkan