This question has gone a week without an answer. As for the business you mention, why not try your local Better Business Bureau? If they have a lot of unresolved complaints against them, you should probably find another source.

In my area, building material suppliers that deal mainly with contractors also sell directly to the consumer. In fact, they like to do this because private individuals are required to pay immediately and do not get a contractors discount. I’ll bet if you showed up at a supply house with cash in hand, they would sell to you.

Good luck with your search.