Can I Set a Minimum Purchase Quantity for a Product?

We don't offer cart limitations for non-allocated, web orders. At Commerce7, we focus on the customer experience for the end user (your customers) and we feel that enabling cart limitations is not in-line with that focus.
You can use our Allocation feature to set Min/Max but this also means the product will be limited to certain customers only. It won't be available for guest to purchase since the product will be Allocated.