If it helps anyone answer my question: the shop sells welding machinery and accessories, some of it can be bought online but other items are welding machines that are built to custom specs per order and can't be priced online. The client wants to remove or disable the 'add to cart' button on the custom products but leave it enabled on all other products. I want to solve this in a seamless way so their customers don't get annoyed. Any ideas are so welcome 🙂