How can we build such a complicate and fast website like ebay.com?

[Jake]

You can find ready made "Clone" scripts that are supposed to function similar to the real thing. at least they can be a labor saving starting point, here are the first few a search brought up:
http://www.youtube.com/watch?v=_bDy4BEohZM
http://www.zeeauctions.com/
http://www.scriptcopy.com/ebay-clone-script/

You would probably still need a competent coder to whip things into shape, there are many on freelance marketplaces like vworker.com, elance.com, odesk.com
I have heard good things about east European and Russian programmers.

Making such a business a success might require a sustained money losing promotion campaign.