What market are you in?

As an investor, your primary goal is probably to buy at the lowest price (you make your money when you buy at below market value), fix it up, and either hold or sell/flip.The seller might realize they "don't know what they don't know"....in general, investors sometimes come across as "transactional" (they ran the numbers, and just want a yes or no from the seller). 

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

Also make sure your contract allows for obtaining financing after the initial seller financing term.

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

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

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.

If the investor's opening bid is the only bid, then that is the market speaking regarding the value of the house being no more than the liens.

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