I always pay cash at my wholesaler. Two events in years past have guaranteed me a discount. One is I complained when I wasn't charged for $180 worth of equipment and the other was when I hired the owner's kid, who was working the counter, to help me on small jobs. Bringing some doughnuts for the guys in the warehouse doesn't hurt either. We're all in this together to make a profit. Never forget that your wholesaler is part of the team.
bob