What subscription are you referring to? If you spend $300 a month you get the big radish program which gives you lower minimums for delivery, but other than that there's no subscription program afaik.
Edited: I guess in the bay area it's a subscription program. In Seattle there's no subscription so I was confused.
"Amazon Prime Fresh members get the benefits of both Amazon Prime and AmazonFresh for an annual membership fee of $299. Prime Fresh membership is currently available only in the Southern California and San Francisco, CA Metro areas."
Edited: I guess in the bay area it's a subscription program. In Seattle there's no subscription so I was confused.