You might also try a mortgage broker. We had better credit but no down payment $ (LONG story people who were here a few years ago might remember). husband had just finished grad school and gotten a job. I was a stay at home mom because my health and all Wiz' issues. The mortgage broker really helped us, and we actually ended up with a much better loan than our credit union would have given us with a full 20% down payment! I checked on it at the time and again a couple of months ago. I was surprised, but quite pleased. We ended up with a brand new home on 3/4 acres with a smaller payment and mortgage than several older homes on smaller lots we looked at. And, fingers crossed, with new homes you have less maintenance for a few years!
I know we just got a flyer from the broker and he is working with people with scores in the low to mid 500s, so maybe one in your area could help you.