Ok, y'alls probably going to hate me but I just got a Series S as well (for my rec room where I game about 50% of the time)....but maybe I can redeem myself. I used something called ZooLert (
https://www.zoolert.com/) and setup alerts at all the major retailers for the X and S.
I did this before the launch and got bupkis for like the first 2 weeks (probably expected as launch allocation was all accounted for). But over the last week I've gotten like 5 hits (4 for the S and 1 for the X) (2 Sams Club, 2 Microsoft Store, 1 <can't remember>). I should have got the S at Sams club but when I was checking out, the site came back as under maintenance and there was another hit for it but it was 2:00am my time and of course was asleep). Got a hit this morning for Microsoft and immediately clicked on it and checked out as fast as I could...lol. On the order page it said ships in 2-3 business days but the order hasn't updated from Pending yet. I'll be selling my X1S and X1X...only problem is that I need another storage card!
Try it out and see if it works for you (note: I am in no way affiliated with ZooLert, just happened to use it and it came through for me)...it may be faster than Wario!!!