To obtain this, go to the left of the Condemned Tower, then down after the Harpy pathway. In this area, there will be a lot of Medusa Heads. If you fall on the right side, you'll find a slot machine with the number "573" on it.
The slot machine will spin to the last three digits of your gold count (if you have 1,945 gold, it'll spin to 945, etc.) If your last three gold digits are "573", then the slot machine will slowly move out of your way.
If you don't have your last digits at "573", go to The Lost Village. All the lampposts you can break, especially the one in Hammer's Shop, are great for collecting money. Blue coins give $1, Bronze give $10, Silver give $50, and Gold give $100. Make sure you know the coin amounts, since the procedure is pretty important.