We have one parts supply place in my town. They typically don't have at least one item I need, so I have to make my customer wait and it's usually a few days until the part arrives. This also forces me to make at least two trips, thus impacting my bottom line I'm new at this but obviously a waiting customer is bad business - especially with mission-critical appliances. I know this is a subjective question, but do any of you stock commonly-used parts and if so, what parts? Obviously, experience will dictate which parts as I gain more experience, but I just wanted to toss this out there.