Amazon Fresh is free for prime members but only for a 30 day free trial and then if you want to continue using Amazon Fresh as a prime member then you'll need to pay a monthly subscription fee to keep using the Amazon Fresh service.
The cost of a subscription to Amazon Fresh for prime members is $14.99 per month or $179.88 per year which is well worth the cost.
With the Amazon Fresh service you have access to a wide variety of groceries that can be delivered to your door without you needing to go to the store.
I tried the free trial for Amazon Fresh and loved it so I signed up for it and pay the monthly subscription and I still love it and highly recommend it to anyone.