Yes, there is indeed a website like eBay in Hungary called Vatera. You can check it out under www.vatera.hu but it is in Hungarian only. The website is working like eBay so people submit items and you can bid on them and if you are the highest bidder the item will go to you.
Furthermore there are also classified websites (just like eBay classifieds) which you can find under www.olx.hu or www.jofogas.hu but it is not based on a bidding system. There are tons of mostly used items which can be purchased for a fixed price often very cheap.