: You can buy the individual "Enchanted" MP3 or the full "Speak Now" album. Use the Amazon MP3 Store to find the track; once purchased, you can download the file directly to your device for offline use.
If you don't need a standalone MP3 file and just want to listen without internet, most subscription services allow "offline downloading":
Searching for a report on downloading "Enchanted" by Taylor Swift as an MP3 leads to several legitimate options. Depending on whether you want the original version or the "Taylor's Version," you can find high-quality digital files through major retailers. Official Digital Purchase Options