At $8 per month, Amazon Music Unlimited was already more affordable than Spotify Premium or Apple Music, but Amazon’s sweetening the pot for Prime members with a limited time $20 credit when you sign up for a new account.

You’ll still get your one month free trial when you start the service, but the first $20 you spend on the service will be automatically refunded thereafter. That means you’d get a total of three and a half months of free music for an individual account, or over a month of the $15 family plan for free. Just note that this promotion is only available for Prime members, and only for new Amazon Music Unlimited subscribers.

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