On my new builds we hit the double cash on cash in certain markets sometimes its only 50%.

It was on the market for a long time because it didn't qualify for conventional financing will it being unlivable. 

Bham is a great market.

Pushing into other, close-by, markets is the best (and maybe only) way to make it work.

That's pretty much the only way you can consistently get higher than market rent via S8.Also, don't make the mistake of assuming the S8 voucher amount is 100% for rent.

I know this is also a National issue, especially in land constricted markets.

I'm starting a property management company and I'm curious to know how people have marketed themselves online.

Do you have experience and know the cycles of your market so you know the best price?

Look for motivated sellers off market and market via cold calling and or direct mail, geofencing, advertising and the like.A good wholesaler is as @Ericka Parrott mentioned, direct to seller, did good underwriting and can deliver an actual "Deal" whether buy and hold or flip. 

Reno Scenerio Off Market Purchase Price - $185k ARV = $315-335kReno - $55-65kHolding - $10kClosing both ends - $25k= $335 , $315-$285 =$30-50k gain  As-IS Scenario Purchase - $185kSale Price on MLS :$225- $235kClosing both ends - $20kHolding - $4k= $235 - $209 =$16-$26k gainIn both scenerios I’ll be 1031ing it into a new investment.