@Account Closed , I am currently in a similar situation as you. I used up the money I saved for real estate in a duplex. I'd like to acquire 2 or 3 properties a year, so the traditional savings route won't allow that. So, some of the things I've been considering are:
Cash out/refinance: Get my money out and go sink it into another property
Owner finance: Find a seller willing to do this type of deal and possibly negotiating a low down payment, favorable rates, balloon payments etc.
Subject to: Find a seller willing to do this, give him an initial down payment and offer to pay their monthly payments and then rent out the place and capture the spread.
I am not an expert in these, and they'll take some legal work, but its a few of the options out there to keep the ball rolling and minimize your risk. I plan on just asking sellers to see if they're willing to do a deal like that, and if they say yes, I'll seek out more specific advice from BP or my local REIA.