Cheapest I have seen is EUR 350.00 ex shipping on eBay-Kleinanzeigen. But it has a 3G backplane only. They are happy to negotiate and even fix a deal ex VAT if you are able to provide a Dutch VAT number. But be aware they sell the whole old garbage still inside as well. So just as full server. In Germany, to get rid of that, you would have to pay additonally.