Alternative Financing When Cash Is Not On Hand

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I found a property that I am interested in purchasing as my first investment property. It is a duplex where one unit is occupied and the other unit is vacant (I plan on living in this unit). The property is for sell by owner and their asking for $89K. What is a good downpayment based on the asking price? Other than conventional financing what are other options to finance the deal? Keep in mind cash is limited. Thanks