Not sure how long this will last, but $20 is definitely cheaper than its $30 retail price. Unfortunately, since it's $20, there won't be free shipping.
http://www.amazon.com/Microsoft-882224277273-Viva-Pinata/dp/B000HCL5QO/ref=pd_ms_vg_46/105-0875660-1997225?ie=UTF8&s=videogames