My bro told me this and I luv it. If you want e-z munnay, get a item that is worth 1000+ rings. Exit chao garden to save!!!! After saving enter again. Pick the item up and go to the black market. Sell AND AS SOON AS THE CHU-CHING IS OVER, RESET. You still have the item AND munnay!!!!!

Note: when you buy something and sell it you get 1/4 of the rings back so 4000 rings, you sell it, you get 1000 rings.