You should automatically get a government credit at closing of $8000, did your realtor inform you of this? Also, there are huge incentives on the down payment through the government right now to help people get the down payment covered. You should talk to your realtor, they have all the latest information on this. If your realtor can't help you, talk to a lender to find out what options are out there for you.
I am not sure where you live but if you live in Los angeles there is a program called HPRP. What they do is help people get off the streets and into stable housing. They pay the security deposit and turn on the utilities. I hope this helps.
ezduzitjoey