I would also consult heavily with your agent as they should have a good idea of what offers are coming through for this property type with rehab required.If you're bringing a cash offer, you can generally be more aggressive (ie lower) with your initial offer.  

I am in the Jacksonville, Fl market and I seem to go back and forth between zillow, trulia and realtor.com, but honestly I rely heavily on my local realtor to give me a good analysis and appropriate comps.  

You WILL need a license to do any kind of commission based work in this state and the laws have been setup to block wholesalers pretty heavily.

@William Brown At a mastermind I was just at, RVM was heavily discussed as it's under scrutiny by the FCC and they are starting to smack down hard on it.

We rely too heavily on technology and lithmus tests when in reality, the best deals are made face to face with people who like another at some level.  

The tough part so far is finding any properties that are so heavily discounted in our area.

Hedge funds were buying housing heavily in 2010/2011/2012 when prices were extremely depressed.  

It's worth it to me because I get to avoid filing a Schedule E which are heavily audited.

Some people heavily promote that idea because it sounds good (aka marketing candy), but they are masking an ugly truth about the high cost of such an approach. 

The realtors that are heavily involved in RE investment attempt to snatch up the best deals for themselves and pass off the thin deals to other, including you.