I don't know, I think there may very well be some Alembics in China. However, an Alembic in China is VERY DIFFERENT than an Alembic being sold on eBay by someone in China. A subtle point, but let's not let the (deserved) anger at eBay scammers blind us to the fact that there are living, breathing people in China, including musicians.
That being said, I would steer clear of any of those eBay auctions. If it looks too good to be true, it probably is.