Victor,
I think a majority of us struggle with this. We have two properties in Ewing and luckily we had the money for the down payment, but coming up with 20% on a $200k-$300k property is no easy day. I'm hoping that someone smarter than me has some better advice for you. All I have is this:
A. You can partner with another investor so you only need to come up with say 50% of the down payment but you need to give up 50% of the profits/rent. 50% is better than no %.
B. I can't believe that I'm even offering this as an option but you could take a loan agains your 401(k) if you have enough in there since you can usually take 5 years to pay that off and by that time you should have enough equity in the home to refinance. Not a great idea but a thought.
C. Is this a property that you can buy and domestically improve enough to build instant equity? If so, you may have an option there.
D. Win the lottery (unlikely).
I wish I had more for you. Best of luck, NJ is a heck of an expensive place to buy property!