The loan essentially cost us nothing (except for dealing with a roommate), and we had an extra $300 in our pocket every month. 

I have been living with roommates in rentals and have become motivated to do the same but actually own the place. 

When I bought my primary residence I was in the same situation - I started looking in May of 2012 and my lease was up at the end September (my roommate was staying but I was leaving and his relatives were supposed to move in). 

I knew that I wanted to buy a duplex when I graduated from college so I could have tenants pay my mortgage, and roommates help with mortgage and utilities.

Also to have a nice place to live that is my own without roommates. 

A young professional could still rent out a 2 bedroom unit and turn the 2nd bedroom into a office or get a roommate or something to that affect but a 3 person family couldn't rent a 1 bedroom unit. 

What about getting into a roommate situation while you are renting and searching for the right multi? 

I will live in the house, plan on bringing a roommate.  

I think the option @Arianne L. pointed out is a great one, and I think what she forgot to mention is that you could still be living rent free, meaning your roommates would be paying your mortgage.  

Stock pile cash and possible get a roommate and live for free and save the additional money.