This is certainly difficult but not impossible to get car without putting anything down. You may try the following resources. http://quotes.automotive.com/?fp=2,1,3&reset=1&dis=D590BFF2-82F5-49AF-AFBD-33209A8ADA57&smtc=Broad
The following may serve you as a good reference guide http://www.ehow.com/how_2188551_get-car-financing-down-payment.html
Let me know if this helps...