How to get financed for a small home purchase?

I have heard that you cannot get financed for a mortgage of under 50,000 through a bank. I don't have strong work history or any collateral although soon I will have a steady well-paying job. At that point, how could I get a small loan of for example 17,000$ without collateral? Can I work it out to pay the house off in payments through the seller before transferring title?