You can set a minimum or maximum purchase quantity for your store's products by downloading the Purchase Quantity Limits App.
You can find the Purchase Quantity Limits App by selecting App > App Market on the left-hand sidebar of your Shop dashboard.
Purchase the app using the card you have on file under My Profile > App Market Billing. If you have not entered a payment method here, you will be prompted to do so before you are able to download the app.
You may manage your app subscriptions at any time by visiting Apps > My Apps. Here is where you can uninstall apps, get help, or report a concern.
When enabled, the Purchase Quantity Limits app will automatically show minimum and maximum purchase notifications on your item’s pages, next to the Quantity field:
An example of a "minimum" quantity:
If a shopper tries to type in a quantity above your quantity limit, they will see this notification, and the order quantity will divert back to the maximum amount once they click off the Quantity field: