Take advantage of Email and the Web. Established customers would be able to email you parts lists for price and avail. and possible pick up the next morning. How about Internet ordering and jobsite drop off? This is just stuff I fantasize about because I have to wait at least 2 weeks to order anything above our petty cash amount and at least 6 months for anything involving purchasing. But I think it would be slick if a contractor could take a pic with his phone and attach it to an email with, "I need this in stainless with a lip. What do ya got?" Maximum interaction with minimum interruption. I would think there might be a market for that.
Joe