Do you have a template for purchasing an item online?

I am not sure if I understand your query correctly. Do you want to sell any products using JotForm? If so, you may create order forms using JotForm by adding one of the payment fields to the form. 

https://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form

If you are looking for any order form templates, you may check our template gallery. 

https://www.jotform.com/form-templates/category/order-form

Let us know if you are referring something different. We will be happy to assist you further.