Purchasing Duplexes

[Esther S]

I'm still in the dreaming stage but are toying with the idea of purchasing a duplex when we're ready to purchase a house in our new location. We currently have a house in MN that we're renting out. We anticipate that once we're stable here, we would sell our house in MN (which could be years down the road) and purchase a duplex. Is this a sound decision? Where could we find duplexes? Realtor.com appears to cater only to SFRs.