Hey @Michael Kreitzer this is a great question that many people struggle with and usually leads them to not doing anything. You must great creative! (Brandon's Book through BP is a great start to get your mind thinking!) AND take action.
I will tell you that depending on your price range and area, finding a multiunit is going to be a little more difficult here in Louisville, KY but Chuck highlights one of your best options which would be to live in one half and rent the other...this would allow you to finance it as low as 3.5% on an FHA loan (some lenders can do a 3% down conventional) as an owner-occupant. Also some other things to consider:
*Do you currently own any property that has equity? You could use this as part of your down payment.
*How about any friends or family that might be interested in working with you? While family can be tricky you might have someone that would be willing to help finance the deal or secure the loan or privately finance the deal.
*How about owner financing? This is not as easy to come across but it is out there.
*Tire landlords is another good one, sometimes they'll be willing to sell at a discounted price so they don't have to deal with the property anymore.
*I don't have much experience with commercial loans but I did just have a friend of mine purchase a 4-plex with 10% down. I am actually contacting that loan officer today for more details for myself.
Hopefully this will get you thinking in the right direction. Michael, Im a broker and investor myself so certainly feel free to touch base with me if you like to discuss more 502-727-9784. Thanks!