Monsanto is one example of a handful of modern seed suppliers using the latest seed/trait technologies towards higher yielding crops.

My reimbursement is stated in the agreement as being done at current cost at my supplier the last day of occupancy.

ken, the US Federal government is the monopoly supplier of the US economy, i.e. a currency issuer, whereas you and I, states and businesses are currency users.

If your GC is not a professional or sloppy on paperwork, this could be a challenge.In addition to 2nd tier subcontractors, don't forget about major material suppliers as well.  

Keep dedicating yourself to your trade, maybe one day you can make your suppliers referrals list.

If the numbers work to stay with one supplier, and the gamble on maybe saving a few bucks isn't worth the effort then by all means do what works best. 

I’m in the process of purchasing a storage unit facility and need to find a spring supplier.

You can buy a lead test kit from any paint supplier and test yourself (super easy/cheap). 

Low barrier to entry - In general a Low Barrier to Entry means: that anybody wishing to enter the business does not have to spend a lot of time and money or make a huge investment to enter into competition with the existing suppliers (for example - a lawn care business).orLow barriers to entry mean that there is not much, such as a high investment cost, to prevent firms from entering the market. 

I think moving to the multifamily space makes sense eventually, just be sure to not take up too much of your broadband.