Unlimited Deliveries for $9.99 a Month Sounds Insane. For Postmates, It’s the Future. Posted by April 4, 2016 Leave a comment on Unlimited Deliveries for $9.99 a Month Sounds Insane. For Postmates, It’s the Future. The San Francisco-based service just rolled out a subscription service that’s impressively cheap. Here’s how it plans to use it to grow.