Hi @drain0,
Welcome to the WooCommerce forum, and thanks for explaining what you’re aiming for. I understand you’d like customers to be able to purchase a single print if they choose, but require at least 10 greeting cards (any mix) before being able to check out. That’s a thoughtful way to manage your product types, and I can see why you’d want a rule that applies only to certain items.
The Minimum Order Amount you mentioned (https://woocommerce.com/document/minimum-order-amount/) is designed to restrict checkout based on the total order value or amount, rather than enforcing a minimum number of selected products. Because of that, it may not fit your needs directly.
For your specific case, here are a couple of plugins that would be a better match:
Another possibility is to add custom code to enforce the exact rules you have in mind. However, please note that writing or maintaining custom code is outside our support scope.
If you’d like, let us know a bit more about how your greeting cards are currently set up (categories, tags, or product types), and we can guide you on which plugin will be the simplest to configure for your store.
We haven’t heard back from you in a while, so I’m going to mark this as resolved – we’ll be here if and/or when you are ready to continue.
If you have a few minutes, we’d love if you could leave us a review: https://ww.wp.xz.cn/support/plugin/woocommerce/reviews/