I'd like to help you, but I can't go below 620. Even if I could, it may not be the best thing for you. You typically see higher rates/fees with scores below 640, and you'll often run in to higher down payment requirements as well.
My suggetion would be to talk to a housing counselor who help you get your credit and finances "mortgage ready" and then refer you to a lender that meets your needs.
I've included a link to a site to find a prepurchase housing counselor in your area.
Best of luck in your search.