First I have heard of LCSC – seems to be the equivalent of the Chinese Digi-key.
Timon claims Alibaba is also a good place to look for parts.
Timon also emphasized the importance of establishing a good relationship with vendors in China, vs a throw it over the wall approach.
I’m not super interested in manufacturing in China but am interested in how our industry and world is changing. LCSC web site seems very well done, but not sure yet how useful.