In order to get as many drachmas/gold coins as you want you have to travel to the city of Ellis (Hera's city). Travel to the top of the city where the Muscle Man is who givess you more strength for drachmas. You will see an iron cow underneath it will be a gold coin. When you travel out of the town of Ellis the music will change and you can go back into Ellis and the iron cow will reappear with the drachma coin placed under it. Keep repeating this to get unlimited gold coins.