I am an agent and investor in the area and my brokerage has a construction company.

Investor friendly agents might have some.

Off-market deals are the best way to secure a low purchase price, however, finding off-market deals can take some persistence (and luck) Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Local meetups. https://www.biggerpockets.com/forums/521Explore Auctions and Foreclosures: Properties in your price range may be available through local auctions or bank foreclosures.Partner with an Investor-Friendly Agent: An agent familiar with BRRRR deals can help you find off-market listings or properties about to hit the MLS.

I know was looking in a defined neighborhood and found an agent to aide in the search.

I noticed that you're an agent in the Austin area.

I have reached out to the mortgage company, the agent I spoke with said that the payoff is non-negotiable, I asked to speak with a supervisor and am waiting on a call back.

Quote from @John Mason: True Having a solid team around you like agent, lender etc.

Secondly I would look into if it make sense using realtor or not, there are markets that it makes sense and there are markets where unless you as the owner are paying agent fee most will pass. 

That said, I would still recommend you have them executed at closing by your closing agent, along with the other docs.