HotStock worked for me recently. My spouse wanted their own and I downloaded the app. I turned on Notifications. It wasn’t the link from the app, but it led me to Wario64’s Twitter and they posted about Amazon. I had to press his link multiple times, but it worked. This was a week ago too. If anything, HotStock will alert you whenever they’re available. I’m not sure if the app is available everywhere in the world. Any type of notification alarm and a keen sense of trying/retrying on a website will work.