CaseKing will ship as soon as it's in stock and has them for retail pricing: https://www.caseking.de/en/amd-ryzen-9-3900x-3-8-ghz-matisse-socket-am4-boxed-hpam-164.htmlIn France it's nearly non available. You can buy it for more than 600 euros (should be less than 550) but have to wait a couple of weeks, but generally they won't respect that and they get your money but would send the CPU whenever they want. Amazon Europe sells it at the "standard" price, 540 euros but "generally available in one month or two" means they have no date. At AMD USA directly, same thing, not in stock. But I'd like to buy it from France since I will retrieve it from my professional taxes.
Mind, even if 1 euro is more expensive than 1 dollar, much higher taxes must be applied in France, starting with 20% VTA. This is why the standard price for Ryzen 9 3900X is 540 euros.