Where can you find a clip for the Chinese sks?

If you're looking for clips to feed rounds into the magazine, Cheaper Than Dirt, AIM Surplus, and J&G Sales should all have them (see corresponding related links). If you want a magazine (which is often mistakenly referred to as a clip), you can find aftermarket magazines (including higher capacity magazines) at those sites, as well - on a side note, I'd recommend you avoid the Tapco brand magazines.

If you're looking for original factory magazines, E-Gunparts (again, see corresponding related link) would probably be your best bet. Bear in mind that the SKS was manufactured in several countries, and the only magazines which wouldn't fit a Chinese SKS are the Albanian ones.

China also manufactures one type of SKS which uses detachable magazines, rather than the fixed magazines - these typically use AK magazines.