Yes you can I do it all the time.
First way is buy for sale by owner, you find a person who's house is paid for and wants to sell it.
I have purchased some with no down payment and very low monthly.
I purchased one from a older couple who just wanted money to live on so they did not want a big pay off just $500.00 a month till they pass away.
I also purchased a home from a couple who wanted out I just got a quite claim from them and I started making the payment to the house.
All these deals have work well for me so good luck!