I just talked to someone with a similar business model for this windshield glass repair. He was spending a lot of time driving and that cut into profits. Couple that with no-shows, trying to find people at their workpalce to bill them, he went to a fixed location and is doing better now. If you decide to go via this route, get their credit card # and bill them before you show up (if that's possible). If they are a no show, make sure they know that you are going to bill them for the full amount. I would charge more than 19 dollars. Time is money and you are saving someone the hassle for coming to them. I'd say that there should at least be a 10 dollar premium over a Jiffy Lube basic oil change. You may want to tack on environmental disposal fees and a gas surchage fee-these fees are easier to digest by a customer if they are delineated separately instead of rolled up in the price. Good luck! PS Don't forget that many cars have a plastic shield under the car and some are a fairly time intenstive to removfe the first time you encounter on (VW TDI is an example).