Your best bet would be to try for a Hard Money or Equity Loan. But to do this you would have to find a property that is in default and has a cLTV (combined loan to value) of 70% or less - in other words, your Loan Amount would have to be 70% or less what the house appraises at. Even then your payments are going to be high as Hard Money comes with a higher Rate (usually 10 - 15% depending on the lender). Make sure it's financially feasible to do so before you buy the house. If you can't afford it, don't buy it. Period.
As far as the person that posted about the 80/20 Loan - these crap loans are exactly why so many people are in default and foreclosure. That is a 100% cLTV loan and is a very bad move to make in today's market. What that means is that you are taking a loan out for exactly what the house is worth. If the market continues to drop, you end up owing more on the house than you could sell it for. They are usually 5 year fixed loans, and after the loan matures (after 5 years) it goes adjustable and the payments go through the roof. Several of my clients are loosing their houses for this exact reason.
As a result, 80/20s are hard to find these days. Most lenders are requiring a credit score of 700 or higher to get them and even then it's iffy. Only 2 banks of the 457 banks I represent still offer this program. The highest the rest are going is a 80/10 or 80/15 and again that's with a 700 FICO (credit score).
I am a Mortgage Broker and Direct Lender