I'm also super frustrated with how Hasbro is releasing this stuff. I've always been against exclusives from the start, but now adding in that you have 10-15 minutes to order or you miss out is a massive joke. Great business model.
One thing that has really helped me is to follow Jayson's Yak Face Twitter account. I do almost nothing on Twitter, but one of the few things I do is follow Yak Face so that as soon as pre-orders are up he sends out a tweet and if I'm not totally off the grid usually manage to get in my order.
Jayson is a godsend for news and links and such. I don't know how he does it. Other great resources are Reddit (r/starwarscollecting and r/actionfigures) plus the various Reddit Discords.
If anyone knows how to use Discord, or wants to learn, PM me and I can send you an invite to the Star Wars Collecting Discord.
It's not much, but it at least helps you get a sense of when this stuff is available so you have a fighting chance