I wanted to offer my friend that I vote for him as a word leader, for money, as I was sure he could not win even with my votes. Accidentally I offered to vote for myself. To my suprise he was willing to pay for it (a few gold around 3-400) So I wote for myself for 300 gold. Worth checking if you have a congress anyway, it might give you free money. If you raze a city, sell its buildings (1/turn) to get some more money, then pillage all field to get some more. If you want to attack somebody, ask around first - some civ might give you 100-200 gold for what you want to do free. Any other not very well known tips to get gold?