State laws vary, but yes you need a Final Release from your GC, simultaneously when issuing the final check.....but that doesn’t protect you from subs/suppliers.  

It is very important to do your diligence and not rely on pro formas sent to you by investor/suppliers.      

Can you ask to see where he ordered them from and maybe check in on the suppliers yourself?

My second option is a local supplier.

Steel has seen a recent sharp spike in price, but like I said, this spring from what I hear from metal building suppliers, they seem to feel as if steel will crash, and that would make those types of buildings more affordable.

I use local suppliers and manufacturers for carpet, cabinets and countertops.

@David Avery I can also see if any of our suppliers have locations in Arizona and if we can do a will call order.

Most suppliers should be willing to hold materials until needed.

The affidavit must state facts showing that the landlord has made and is making diligent efforts to repair the condition, and it must contain dates, names, addresses, and telephone numbers of contractors, suppliers, and repairmen contacted by the owner.

All you need is one supplier or subcontractor to claim they didn't get paid and the cost of the simultaneously issued owner's policy pays for itself.