Are you trying to find one of those hard to find parts? There Internet is the place to be when looking for these kind of parts. All of the different parts stores have the web sites that give you the ability to be buying auto parts online. There are also a few that are an auto parts warehouse online and can sell parts at discounted prices compared to the normal stores. These kind of places are more likely to have a part you need. If the part your looking for is not in any sort of reproduction, OEM or aftermarket, then you can still by used. There are people selling many parts all of the time like eBay motors. This portion of the famous auction site is like an online swap meet where you can find almost anything that you can bolt to car. So if you can find it at the online stores try eBay Motors.
In the case of a garage, you can bring your own auto parts! auto supplies stores near me learned this while doing the marketing for an online parts store. I just bought brake pads and brake rotors online (they didn't sell calipers online but I am fortunate enough to be working in the same building as their bricks and mortar auto parts stores nearby so I bought the calipers there).
You will charge them price for displaying their listing of what they need. You then charge them when they find on your site what they are looking for.
Auto repair books and manuals can be found in the parts stores, in the bookstores, and online. Amazon offers a good selection of Haynes and Chilton repair manuals. Those are sorted by year, make and model of each vehicle. You may even buy them used if you wish.
Garages set out your bill for repairs by stating the cost of the parts, and the cost of the labour to fit them. As we all know, garages make most of their money with the labour, and even car parts costing just a few pounds can end up costing you several hundred pounds once you have added on the labour costs.
Usually when individuals are searching for parts for their cars they think that new parts will function a lot better than old ones. Well, this is a myth because used parts are very effective on your car and will save you a lot of money. When you purchase old parts you will be getting the same quality or sometimes you may even get better designs that will be effective on your car. If you want to purchase new parts for your car, then that is also fine and you just have to make sure that they are functioning properly and will give you a great driving experience. The parts of the car should allow you to drive with ease and not have to constantly worry about the part becoming damaged or broken.
It's sometimes the only option. With classic cars and out of production models, using salvage car parts is sometimes the only way to get your hands on parts. Many classic car marques actually have a substantial salvage parts business that has grown up around them, and networks of enthusiasts are a great way to source parts at a price that won't break the bank.