One of the trucks needed a new rear end, so Matt took it to a guy that came referred. Matt never asked how much it would cost. The job needed to get done regardless. When Matt went to pick up the truck, the guy told him how much, and Matt says, "are you sure you charged me enough, that doesn't sound right." The guy says, "well normally I charge 'such and such', but this job was so easy, everything just came off so nice, and went back perfectly. Sometimes I'll be wrenching for hours, but this wasn't like that with your truck, so i'm passing the savings on to you." So I got to thinking....Say you give an estimate for a price for a lawn cut. After mowing it, it was way easier than you expected, and you got done a lot quicker than you anticipated. When you send out the monthly invoice, do you discount the price you previously quoted the customer? Or do you stick to your original price and figure it's better for you to keep the extra few jacksons in your pocket, than to let them keep 'em in theirs?