For negotiating:I'm assuming go to local stores (not box box or chain) to get quotes, but what are you successfully haggling?  

Any illegal activity like drug dealing, prostitution or gambling can attract unwanted elements.

I thought builders/contractors etc used other stores outside of the "mainstream." 

The best deal I made (for me) was an 75% Interest in a small property rented to a convenience store.  

If the tenant does not dispute the deductions or the amount due and payable to the tenant within sixty days after the itemized list and amount due are mailed as prescribed by this subsection, the amount due to the tenant as set forth in the itemized list with any amount due is deemed valid and final and any further claims of the tenant are waived.”To further address your specific concern, there is a particular element in the quoted section of the law that requires an action from the tenant.

They didn't have to drive to the store?

Again, the BiggerPockets store has some books on this topic, or you can learn about it by watching podcasts, reading blogs, and interacting on the forum.

I am concerned about where all this data is stored

I know of an investor who bought one of these, use it for a few days, and then returned it to the bigbox store once the HVAC was fixed.

Curruthers illustrates how trust, communication, and mutual respect are essential elements in fostering these connections.