This is proving to be much harder than I thought it would be. I sell two different kinds of chocolate bars. I have free shipping, so I'm not concerned with shipping calculators. I want to sell a minimum of 5 bars of either kind. I want my customer to be able to fill their cart with any number of either bar as long as they have at least 5 bars when they try to check out. If they have less than 5 bars total, I want them to get an error message. I'm getting tired of trying to find an app to do this. Maybe I've built my store wrong, but I just can't find an app that works the way I want it to. Reach out to me if you're interested in working on this.
I don't know if you found someone to take care of this for you or not but I would love to look at it. There's a fairly easy way to implement this. I am a US based developer and I have done quite a bit of custom Shopify template/app development. If you are still looking for someone, email me at firstname.lastname@example.org and I will take a look!
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