Where can i buy laptops without ram and such?

I have many spare parts at home

Something I've seen so far only occasionally needed, but what is "and so"?

And so: meaning the spare parts are missing and then I reinmache spare parts

You'll have to search long enough to find something that you need. And much longer for laptops, notebooks and co. Until then, the stuff is so outdated that you can't do anything with it.