Any advice on most efficient and costly ways to obtain marketing lists in S.

What market are you in?

@Dave Rav - I agree with the others that there is no really good way to estimate insurance costs, but I've found some consistency within a particular market/zip code if the rebuild costs and deductibles are the same.

I'm thinking about ramping up my marketing and having agents send me deals with their criteria.

I have searched online and found no company or market for this type of transaction.

If not, and if these are homes that are in a market where dispositions are not too daunting you are likely best served selling these homes and re-investing in properties that can lead to additional equity.  

You can generally place a voucher tenant in any property.In order to place a section 8 tenant you will have to pass an initial inspection as well as an annual inspection where they tend to be more strict and have you fix things that you may not have addressed for a market tenant.

That is a very general question and each area has its own market conditions so what works well in one area may not in another.

Sat on market for 4 months before they dropped to $125k.

Historically real estate and markets are nearly identical over a long period of time.