You might be wondering if it is really worthwhile buying online as there is the freight to consider. But don't forget that your bricks and mortar stores also have to pay freight on the parts they get - and they then pass that cost on to you, as well as their other overheads. By buying parts online you can often get steep discounts as online stores do not have to pay staff or rent for a shop front. And often they will give you free freight if the cost of your purchase is over a certain amount.
A machine's brand name does not mean all its parts are composed of the same brand. Parts and pieces may have built through other brands. These other brands should still be compatible to the actual unit though. As mentioned on the paragraph above, choose what is best according to most users. You can trust the opinion of experts and professionals with repairs.