How do I limit the products with a certain quantity?

I've got a small egg business in which I use an order form and I have delivery days such as Mon,Tue,etc. I was wondering if there's a way to automatically hide or display a text saying unavailable next to one of the days. So when a customer orders some eggs, other people can't order eggs on that particular day, because I only get 12 eggs a day.

I would suggest you take a look at the Quantity Gift registry or the Inventory widgets to get the order on your form:

https://www.jotform.com/widgets/quantity-gift-registry

https://www.jotform.com/widgets/inventory

You will also need to add a Form calculation widget, to calculate the total. Then you can use this total for the payment if you want. 

For more information, you can click here. 

Let us know if you need any further assistance.

Thanks.