The well known money trees have money growing in them...
But thats too easy, isnt it?
Mine drops coins on the floor. The silver ones arent worth a thing, but the gold one IS!
And its temp, so you have 60 seconds to pick it up and get payed. This way, just racing along and checking to see if there is money wont help you.
Come take a look at Astylus(80,182)