I think that's very very difficult to do to be honest, though. There are variables such as prices based on location, and within that location, what the shop or

I think that's very very difficult to do to be honest, though. There are variables such as prices based on location, and within that location, what the shop or store wants to charge you. The same person with the same car can go to the same location twice for an oil change & get two different prices. I know because I've had it happen to me. The price differed by a few dollars, but still. Take it one step further & any shop that's established will have tools built specific to them where they can charge whatever they want on a sliding scale. Go to STS Tire in a nice, fancy area. Ask for a quote on a particular service. Note the price. Ask for the same work to be done in an impoverished area & ask for the same work to be done. The price will be radically different, especially if the shop owner isn't greedy. I think you're on to something, I just think it would take a substantial amount of work but figuring out how to do that in the most efficient way to collect all those data points makes everything easier. Smells like a project to me. :D