It is highly recommended to shop around before you book MOT test, but at the same time, you should also know that test centers are not allowed to charge more than the official limit. Therefore, you can get tricked to a particular point only. When it comes to inexpensive centers, they do it for less money if you guarantee that all the reparations are performed in their garages. In other words, they give you a discount in order to keep your business. You should also pay attention to how much they charge for reparations, only to prevent any unexpected surprises later.