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Hi, I’m looking to buy a new keyboard or topcase for my MacBook Pro and have found these very cheap listings from China. Why are they so cheap? Are they real and if so do they differ in any way from the expensive original Apple parts? Thanks. https://m.aliexpress.com/item/3292477986https://m.alibaba.com/product/6078508515

What happened when you went to Apple to get your keyboard fixed under the extended warranty? These newer keyboard are much harder to replace than the older retina models as such I would recommend you get an uppercase which already has the keyboard installed (2nd hand part)

Those are aftermarket spares, they will work but do not expect the same quality level you find on original parts. Keyboard will work, but will likely require a somewhat stronger and more precise pressure whereas original parts are more forgiving. If you are a professional writer you might dislike or even hate a replacement KB, most users would hardly notice, it really depends on your style and expectations. Topcase is quite certainly original, but it might be refurbished with aftermarket parts, you will have to ask the seller for confirmation and details. If I have the chance, I prefer using for my repairs 2nd hand original spares rather than new aftermarket.