A $6,000 house in Philadelphia would require many more thousand of dollars of improvements to make it a safe and secure place to live. First, you need to get help finding temporary housing, and then get help finding assistance to help you pay for long term place to live.
Cherry Hill, NJ
You may want to try a few of the Real Estate web sites. Trulia and Realto.com are a couple of the really good ones. They allow you to search for Real Estate listing in all area's of the US. Another solution is to look online for a Realtor in your area or the area you would like to live in. They should be able to help you with making this possible.
Just for the record, sure, you can buy a home for less than $6,000. Plenty of mobile homes sell for less than that, though you'll also have to pay ground rent.
Or you can buy a property "subject to" an existing mortgage. You get the deed, sometimes for no money, sometimes for a few thousand. But then you have to make the monthly mortgage payments.
Or you do an equity share with someone with the necessary downpayment and credit.
But in your case, the question isn't one of finding a house to buy. It's finding a stable place to live.
Hope that helps.