I was able to get a Series X earlier this year. There are a handful of Twitter accounts that post up to the minute stock updates. If you load the app on your phone, follow those accounts and subscribe to alerts on your phone you'll get a push notification the second they post something. I had gotten a few false alarms for PS5 stock alerts (because the same accounts usually do both) but it ended up working out for me. They posted a Best Buy stock alert and I had one ordered within 10 minutes.
I still have my One X sitting here and I'm not entirely sure what to do with it. Over the period of maybe 6 months I'd gotten 2 of the "green screen of death" issues, but was able to hard reset both times and I didn't have any other issues. I pulled the trigger on the Series X when it became available though.