It was a 3 bed, 2 bath double-wide with an added carport and central air.It was $140,000 delivered from PA to MA on to rented land. 

I feel like it would be similar to buying a double wide in a park asa rental.

There's a wide range of perspective and expectations with new investors...so depending on your goals, one market may really favor you over the other.   

These are three modified double wides.

Here, because of zoning, you can easily find a half million dollar home next to a single wide mobile home.

There is a wide range from 360-420k.  

There seems to be a pretty wide margin between old rundown but still expensive  duplexes (due to proximity to city center) vs more modern still extremely expensive duplexes (due to a combination of things).  

Take it and open the door wide for them on their way out.  

They offer hundreds of hours of on-line classes covering a wide range of topics plus numerous live classes (mostly in Texas) and as long as you are a member in good standing you can always call a mentor for advice and ideas.My wife and I have been flying down to Dallas and Houston for years to attend their live classes and have invested in properties both in Texas and in our home state of Michigan.You asked for numbers, so here are some numbers. 

There is such a wide range of opportunity out there but I tend to gravitate towards the smaller-tier (in terms of price) single-family homes-- in large part because that is where the bulk of my experience lies but also because of the sheer numbers of these potential deals out there (at the moment, don't have current real figures in terms of percentages of owner financing to bank financing in this area but it is significant).