In Mas Ora's district of The Munari City, go to the House of Soleil. It is the first building on your left after entering Mas Ora's district. There will be a human standing directly in front of you, asking for a loan of 1000 gold. Give him the loan and he will give you a Bodril. Keep it and later in the game he will offer to pay you back. Instead, tell him that you want to buy the Bodril for 5,000 gold. After this he will ask if you actually want to buy it. Answer "No". You will gain a little bit of experience and 1200 gold. Do not leave. Continue talking to him. He will keep asking if you want to buy his Bodril. Keep answering "No" and he will give you 1200 gold each time. Repeat these steps to get as much gold as needed. However, once you leave the area, he disappears and you cannot do it again.
To increase your skill and get money at the same time, go to the arena in Munari city and play "Survival". You have to pay 1,000 gold, but you can get 5,000 back, depending on how far you get. You also get experience points for killing the monsters.