I'll second what Tom said, I'll go out of my way to go to the "to the trade only" supply house. I'd advertise it to the contractors, "We sell to the trade only, we don't support unlicensed handymen"

Steve, I spent over 5k last week in ONE supply house and theres 8 of us that are service in the company I work for and 80 guys total. Do the math, 3k loss from a handyman or HO is nothing compared to the business I can take elsewhere.

If selling to HO's (which I really have no problem with) take EC's ahead of them if the HO's have a bunch of questions.