Make your own. You could even scrape auctions from eBay. You might think it's impossible but every other country seems to have a homegrown one, and not many people habitually go to eBay.
If I'm buying random funkis furniture or computer bits and bobs I can probably use Tradera, and if I want fancy furniture or jewlery or something then there are coalitions of auction houses like Auctionet out there - but as soon as something gets even mildly obscure then there's nothing that has the reach and coverage of eBay.
Starting a new online auction site sounds like a terrific way to throw money away.