1. YouTube Music: You can purchase the "Thriller" music video in HD quality on YouTube Music.
2. Amazon Prime Video: The music video is available for purchase on Amazon Prime Video.
3. Apple Music: You can buy the "Thriller" music video in HD quality on Apple Music.
4. Google Play Movies & TV: The music video is also available for purchase on Google Play Movies & TV.
5. VUDU: You can purchase the video in HD quality on VUDU.
Once you have purchased the music video, you can watch it on your computer, mobile phone, or tablet through the respective platforms' apps or websites.
Please note that the availability of the music video for purchase may vary depending on your location and the platform you choose. It's always best to check the specific platform for availability and pricing information.