Buying your own car wheel bearings can be more cost effective, as you can get them for a very reasonable price from specialist bearing and car part websites. You can have them delivered this way as well, so it’s very good value for money. There is now a wide selection of bearings available online and you can get anything from open ball bearings, to shielded ball bearings, to wheel bearing snap rings. You will be able to find what you need easily.
The downside comes if you don’t know exactly what you need. It can be difficult for you to track down what you need, and to work out what you are going to require. If you are booking your car in for an MOT or a service, the mechanic should be able to source bearings for you. They can then inform you what you need and order them in, so you know that what you are getting is exactly right.