You can also buy washing machine parts from a bricks and mortar store - if you can find one nearby. You will often have to end up ordering it at the store and then going back to collect it when it finally arrives, as many stores do not keep any but the most common parts now. They do this to reduce their own costs as it is no point them carrying a lot of parts that may well not be needed. They could sit on the shelf for years until that model appliance went out of date and then they would never get sold.
You probably wonder why there is a need to look for washing machine spare parts. It is easier to simply entrust concerns with repair men and centers. Not all repair personnel and shops have the parts you need though. Some may offer to shop for you. Yet some will have you look for parts yourself.