Subscription Limits for Physical Products

Hello!

Does anyone know of a workaround or an app/extension for limiting subscriptions for physical products? 

I sell a specific number of hand-made products on a monthly basis and it scares me to think that I would have to monitor all day and night to make sure I hide the subscription when it gets to a certain point.

Is squarespace working on a way to have different subscription settings for physical vs digital products?

Thank you!