Why would you want one? They're significantly slower than any Ryzen processor (and even dual core Intel processors) as they are Excavator based. But if you do want one, you should ask Newegg when they are expected to be in stock.
Why do I need an expensive Ryzen when a cheap Excavator with integrated GPU is just enough for my rig?
Newegg customer service is clueless about stock (everything).
Then the question becomes, "Why do you need to upgrade to a Socket AM4 machine with its required DDR4 RAM"?