Each new batch produced is given to a certain customer in order o priorities and signed requests that AMD has. Restock wouldn't be homogeneous all around the globe. Also, in those situations, the customers that use to have the high priority are system integrators (so, CPUs sold by AMD to PC manufacturers, not to be sold as stand alone parts). And yes, there's also a lot of stockpiling on the final link of the supply chain. They expect to make a lot more money if they wait 2 weeks and people get crazy purchasing at those prices way over MSRP that you are already seeing (and not in scalpers EBAY auctions).
If the e-mail notifications system of one of those pages has been setup wrongly (sending e-mails to anybody signed just at the moment the stock appeared), you are not going to receive anything because it most probably has become saturated and shut down. If the e-mail system has been set properly, then it's going to warn the first X people signed if the stock increases in X and giving those X customers a couple of hours to confirm the purchase. If the time is out, then that customer loses his opportunity and an e-mail is sent to the next in the queue. First come, first served; you will be in a queue of tens of thousands of people. EVGA uses that system for the RTX3000 cards orders and not so many days ago they was still working fine but had a delay of 30 days (they were serving orders made 30 days ago, so imagine).
But anyways, you should forget about those new parts scarcity and stick to your planned purchase: 3600 range CPU and 1600 Super or 2060 as GPU. You waited all that time to achieve good prices that could fit in your budget; not to switch to expensive new-gen parts and to have to battle for one of them. The only I'm sorry is that craziness of prices had made you wait a lot more than expected.
That's why I said you to go VERY cheap on a GPU. And when I mean VERY is VERY. Go to Ebay and search for the cheapest old-but-not-so-much card that you could find (a GTX970 for example). Something under $100 total cost shipping included. Plug it on the new computer and done, you will be on business finally. It doesn't matter at all that it will BURN in 3 months, for that time the scarcity of new parts will be gone (plus NVidia and AMD would had released the new cards on the mid to lower tiers) so the old gens market should finally stop being a nest of vultures. When that moment arrives, objectively, the price of older cards should had sink way more than the $100 you could spent now on that placeholder. With the 3060Ti near to release and having the expected MSRP and a the performance of a 2080 Super... nobody is going to sell the cards you are looking now for over $200 (well, they could try, but they aren't going to sell anyone).
Your only problem now is to purchase the CPU; sadly I don't think you achieve the very low price you saw some months ago, but take the first opportunity you find on a reasonable price (not good, just reasonable) and done. The 3600 has not gone worse just because the 5600X has been released; it will serve you very well and, in a couple off years (half the way to the expected lifetime of that rig); you could change it for a 5950X (that at that moment would be way cheaper than now just released) and skyrocket your computer again. Your board and RAM and the other parts of your system would not need to be changed at all.