For those of you who really want these and are in the USA (and I swear, I am not affiliated with iStockNow)... go to their site, choose the phone(s) you are looking for, log in for email notifications, and when one hits your inbox, go reserve your phone. Some of these are refreshing at night because it's been 24 hours and nobody picked up a reservation, so it went back to stock. Others are new shipments in the morning (usually around 5-6 am local time, per my observations of when I'm getting email notifications).
I snagged a 256GB Space Grey AT&T model for my husband on Sunday when his preorder was at Nov 17-24 and I felt terrible because mine and my son's both got launch day delivery.
I have used iStockNow for years to find iPhones and I swear, I should just give up and become a personal iPhone shopper because I could've already bought at least a half dozen extras locally without much effort.
If you are in the US, near any Apple stores, and you want one of these, you should be able to lay hands on one within the first week of launch if you are getting stock alerts.
Sidebar anecdote: Last year, I ordered a Rose Gold for launch. I'd had a Rose Gold the year before and realized I was bored with the color after I received it. I had managed to source a Jet Black within the first 2 weeks and was able to return my RG one for the JB. I'm not kidding when I say it just takes a few minutes of planning on the front end, but you can find a phone if you want one. Jet Black wasn't exactly easy to find last year, but I found one. And, I wasn't really trying that hard. I just used the tools that are out there to help me locate it.
Since I got my husband's phone reserved on Sunday, I've gotten 5 more emails for the same model of X. I could have bought all five of them and if I knew people locally who wanted one, they could have bought them. Just emails. They even have links in the emails that take you directly to the Apple Store.
TL;DR: Work smart, not hard.