If a bit of self-advertisement is allowed, my Android app "amiibuddy" can keep track of website stock for you from a bit over 20 different sites, and send push notifications to your phone when they become available.
In addition, you can turn your NFC-enabled phone or tablet into an amiibo reader that lets you change themes or play music just by tapping amiibo onto it. amiibuddy automatically recognizes what character it is and adds it to your own personal checklist. You can see a fan-made video of it in action here:
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Topic: amiibuddy - Use amiibo on Your Phone or Tablet
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