The Warrior

After getting more money, you can using this guide to getting more Eridium in Borderlands 2 Game.  Here is the guide
How to get More Eridium
Navigate to the North-West after you have reach the "Three Horms Valley" run till you have to defeat "Bad Maw" aand collect every Eridium. After you have fight all enemies you have to enter the "Bloodshot Stronghold Area (Don't forget to save your game) Now go back to previous arae and fight Bad Maw again to collect even more Eridium