http://store.outspark.com/fiesta
Outspark has a cash currency called Sparkcash. Where you charge up real money (using paypal/click and buy) to get Sparkcash.
You get 7000 sparkcash for every US$10.
The items in this shop can only be bought using sparkcash, and the items are not tradable at all in game (you cant even switch it between characters once you've activated it).