Importing electronic from China - need your help

I have forgoten
Where can i find something usefull about import ? I have written few topics on this forum but i think it's not enought even for a begining.

You seem to be searching for some easy shortcuts that don't exist.

Many of the cheap manufacturers don't have decent websites and the sourcing for this type of business is still being done primarily offline.

hmm
How can i find them ?

People usually find it through business networking, and while I can appreciate your desire to find a shortcut I hope you understand what the status quo is.

The easiest way would be to find out who the business you seek to emulate use, or to look at the products that you want to see the manufacturer.

If it's not on the product itself there are still ways to find out (e.g. place a phone call to a distributer to ask, look up importing documents etc) but I can't give you specifics there as I have not had to do that.

It is really difficult to buy only 100pcs at a very lower price. Almost certain, there would be no factories want to do that. However, it doesn't mean you don't have chance at all. Some factories may have some over run for other customers; you may want to check it out.
As for the database of manufactures, it is just too easy to get, go on Internet and type in a few key works in the search engine, you will get it.
It is a one-time deal for the factories considering the quantities you are buying, and you are right, sending defective products back to China is even more expensive than the products itself. So, warranties don't make too much sense in Poland for sure. The bet for you is find the reliable factories, their prices may a bit higher, but you will save a lot in future to replace returns from customers. Remember, in China, they can make anything depends on how much you wish to pay that. It is sometimes, unfair to say, Chinese only make low quality products, think of how much we are paying.
Insurance, 1-3% percent of 110% invoice value is the usual practice.
Anyway, I happen to have experience in these products, you can email me if you want to know something further.

Most of the exporters not having websites and trade only through alibaba. you can chcck there.