Hello @ddenby
You can try our app
https://apps.shopify.com/purchase-limit?
Let me know how it goes
Topic summary
Goal: For a Shopify store selling one-of-a-kind paintings, limit each product to a quantity of 1 in the cart, since stock set to 1 still allows multiple units at checkout.
Suggested solutions:
- Use an app:
- Order Limits (MinMaxify): Set a maximum quantity per product and possibly per product groups; may also restrict which products can be purchased.
- Purchase Limit (MageComp): Purpose-built for quantity caps.
- DC Order Limits: Create a rule, set Maximum Quantity to 1, and apply by Product Variant so each unique painting is limited to one. A screenshot and a video demo were provided.
Custom approach:
- No built-in theme setting was identified. Implement code to: (1) on each Add-to-Cart click, check if the product already exists in the cart; if yes, block and show a message; (2) hide the quantity selector on product and cart pages.
Other tip:
- Try setting Inventory policy to “Deny orders,” though details weren’t provided.
Status: No confirmation from the original poster; solution remains open. Attachments (screenshot, video demo) illustrate the app-based setup.