Now after this news I will try to leverage that to negotiate it down to 300 to keep my all in budget with repairs under 420.

Maybe you can work at a discount rate and ask to see the monthly budgeting. 

You aren't going to find a ton of agents grasping to take your business with no verified deals and a 100k budget.

If I go over budget, it's out of my pocket. 

Lets look at 1 item in a capex budget.

I did some postcards and yellow letters with them at the time but ran out of marketing budget so hung it up.

Went over time and budget.

When I have watched shows where they build houses out of containers, it never seems like the budget is any less than a conventional build.Again, I love the look, but at this point I see them as a passion project for a developer more than any financial incentive. 

When I have a client with that need, I pull comps and look at each listing individually and find fixers and fully rehabbed homes and help them develop a budget based on the sale price per square foot for the pre and post rehab properties. 

I called a realtor who's a buying agent who's been looking for deals for me (none closed yet)...told him the situation...told him "we need to find her a place to rent, her budget goes up to $1,300/month."