Get to Ope's Cave in Act 3, then use the "Duplicate Weapons" glitch to copy your most valuable weapon. Sell the weapons to a vendor to get a lot of money, then purchase Oleander from a vendor if it is available. Taking as much Oleander as you can buy, fast travel back to Ope's Cave and turn it in to the tribesman that give you the Continuous Event "Dreamtime". Every time you turn in five Oleander Blossoms, you will receive $1 and 1,000 experience points. Repeat this as many times as desired.