I think the best bet is to compile a list of companies that you think have potential and then begin networking with them.

I would highly recommend not going with a $5-10 / month bookkeeper to compile your financials.

Make a list of cash buyers that have purchased from the tax records, plus wholesalers that have a reputation for selling a lot of properties in your area and start compiling their contact info.

Lots of knowledge compiled on this site, just have to seek it out!

Kristine Marie Poe  was so careful to document rent comps, and stay at arm's length in the compiling of them, when she was writing above.For example, if you jacked up your tenant's rent from $3K to $15K/mo to ensure they would leave, there is an argument that your true intent was to evict the tenant, but because you did not have "just cause" you did it anyway through a different means.

There are also services like Data Quick, Haines Criss Cross, Real Fast Data, Realist, etc. that compile info from multiple sources.

Compiling and reviewing it each month helps reinforce this discipline, makes you think about legacy assets in your portfolio (regardless of asset class) and how they are performing and reminds you of the big picture.I have two colleagues that we share our statements among one another and it's both to get an outside perspective on mix, diversification, tax efficiency...whatever we see where we can help and it's also forced accountability...if we have to share the thing each month, we are trying to find ways to improve it.  

Check this threadhttp://www.biggerpockets.com/forums/69/topics/60001-compiling-arv-data

Both of these offices may be online.As JB shared, many times there are local investor/realtor groups that compile all this information and provide it for a fee.

This database is compiled from counties, Department of Corrections (DOC), Administration of the Court (AOC), and state sex offender registries from across the country.