https://wccftech.com/amazon-music-announces-hi-fi-option/

Shortly after Apple Music introduced lossless audio streaming for users at no additional cost, Amazon Music pounced on the opportunity to provide a Hi-Fi option for its subscribers too, and with the same benefit; no extra charges.

According to a report from Billboard, Amazon Music HD will now be available to Amazon Music Unlimited subscribers without paying a single penny. Previously, Amazon Music HD cost $14.99 a month for regular members and $12.99 for Prime members. The service is now available with Amazon Music Unlimited, costing users $9.99 monthly for regular subscribers and $7.99 for Prime members.