Posted by Adv.Pack Yongnuo tends to be very cheap. I always buy their speedlight flashes. Sometimes you get really good ones but other times, parts start falling off after a couple weeks of use. I would definitely try it for $50 though. Considering the cannon version is like $500
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Well the Canon EF 50mm 1.8 is cheap and plastic to begin with. I have the non-STM version and auto-focus is loud as hell which is like the knock off you're trying to buy. You should be able to find a used one for $50-60.
You can also get the nearly silent non-rotating front element EF 50mm f/1.8 STM or EF-S 24mm f/2.8 STM (to get you to the same view as 45mm in film) for under $100 at their refurb store with warranty.