I purchased a set of SPD cleats from a seller in China. They were roughly 4/5 the size of real ones, and no they don't fit any pedals though they look great.
I buy bar tape and cables with no issues but since Shimano has no Chinese assembly lines that I know of (can't speak for other brands) as far as I can see the seller would have to be selling stuff that was imported to China so exceptional low prices set warning bells off. Return shipping to there is very high.