Rental assistance

Anyone have any resources to help with security deposit, firs months rent or financial assistance period? I’ve tried going through cornerstone they offered to pay first month rent or security deposit but when I found a place and was ready for them to do their thing they told me it was too much, and when I asked well how much can you do, he said he didn’t know it depends and he would have to talk to his supervisor but that can take a few days which would interfere with when I needed the security deposit by. Super frustrating trying to avoid homelessness with by children.