Finding Multifamily Properties

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I live in the Minneapolis area and am looking at purchasing a multifamily home to both live in and rent and ultimately acquire many multifamily rentals. In my area duplexes, and the rarer triplex, are not the norm- single family homes reign here. While duplexes are available on the market it seems to be a challenge to find ones that don't need a ton of work in close proximity to each other. I've only been looking online with Zillow, and am wondering what other websites, tips, or techniques people have or use when searching for properties to ensure they are finding everything that's out there, or hearing about new properties that come on the market quickly. 

Any other advice regarding the acquisition and holding of duplexes that you wish you'd known when starting out investing would be awesome as well!